From wiki, you'll notice that the term is actually very broadly defined:

Sexual orientation is traditionally defined as including heterosexuality, bisexuality, and homosexuality, while asexuality is considered the fourth category of sexual orientation by some researchers and has been defined as the absence of a traditional sexual orientation. An asexual has little to no sexual attraction to people.[4][19] It may be considered a lack of a sexual orientation,[20] and there is significant debate over whether or not it is a sexual orientation.[3][4] Most definitions of sexual orientation include a psychological component, such as the direction of an individual's erotic desires, or a behavioral component, which focuses on the sex of the individual's sexual partner/s. Some people prefer simply to follow an individual's self-definition or identity. Scientific and professional understanding is that "the core attractions that form the basis for adult sexual orientation typically emerge between middle childhood and early adolescence".[1] Sexual orientation differs from sexual identity in that it encompasses relationships with others, while sexual identity is a concept of self. The American Psychological Association states that "[s]exual orientation refers to an enduring pattern of emotional, romantic, and/or sexual attractions to men, women, or both sexes" and that "[t]his range of behaviors and attractions has been described in various cultures and nations throughout the world. Many cultures use identity labels to describe people who express these attractions. In the United States, the most frequent labels are lesbians (women attracted to women), gay men (men attracted to men), and bisexual people (men or women attracted to both sexes). However, some people may use different labels or none at all". They additionally state that sexual orientation "is distinct from other components of sex and gender, including biological sex (the anatomical, physiological, and genetic characteristics associated with being male or female), gender identity (the psychological sense of being male or female), and social gender role (the cultural norms that define feminine and masculine behavior)".[1] According to psychologists, sexual orientation also refers to a person’s choice of sexual partners, who may be homosexual, heterosexual, or bisexual.[21][22][23] Sexual identity and sexual behavior are closely related to sexual orientation, but they are distinguished, with sexual identity referring to an individual's conception of themselves, behavior referring to actual sexual acts performed by the individual, and orientation referring to "fantasies, attachments and longings."[24] Individuals may or may not express their sexual orientation in their behaviors.[1] People who have a homosexual sexual orientation that does not align with their sexual identity are sometimes referred to as 'closeted'. The term may, however, reflect a certain cultural context and particular stage of transition in societies which are gradually dealing with integrating sexual minorities. In studies related to sexual orientation, when dealing with the degree to which a person's sexual attractions, behaviors and identity match, scientists usually use the terms concordance or discordance. Thus, a woman who is attracted to other women, but calls herself heterosexual and only has sexual relations with men, can be said to experience discordance between her sexual orientation (homosexual or lesbian) and her sexual identity and behaviors (heterosexual).[25] Sexual identity may also be used to describe a person's perception of his or her own sex, rather than sexual orientation. The term sexual preference has a similar meaning to sexual orientation, and the two terms are often used interchangeably, but sexual preference suggests a degree of voluntary choice.[8] The term has been a listed by the American Psychological Association's Committee on Gay and Lesbian Concerns as a wording that advances a "heterosexual bias".[

That link you provided is in the context of homosexuality. Pedophilia is not legal so the definition provided by the APA reflects that. You need to understand how the mental health professions operate. Definitions are not fixed in stone and are constantly updated.

Here is an article from 2013 where the APA says they will reword their definition of pedophilia after a public outcry. https://archive.is/4SFFh. That was a few years after the 2009 bill debate. They could always change their minds again. As I said, it's more to do with politics than science as the brain and mental world are still not well understood.