I watched the video. The first half is mostly factual, but it is important to keep in mind that Satanists have little or no incentive to be totally honest. When Anton LaVey started the Church of Satan, he disregarded most of what had come before him and threw some bits of atheistic philosophy from various sources together to create something that suited him and called it Satanism. It doesn't make much sense for his followers to pretend that they have a monopoly on Satanism, or that their form of Satanism is the true form. Anton LaVey lied constantly, even by his own admission. He was also a hypocrite - he was not kind to animals.

It is hard to tell if the person who made this video is a bit naive and inexperienced, or is knowingly and dishonestly trying to whitewash the most sinister forms of Satanism. There really are Satanists who torture and murder people, and sacrifice living creatures to Satan or other demonic entities. When you hear someone saying something like, "A real Satanist would never hurt anyone", it is a lie.