FYI, this was found by setting the google tools search to only search for dates before the arrest.

https://www.dailydot.com/debug/reddit-maxwellhill-moderator-technology-flaw/

first I found this, where it describes the user as "he", but doesn't say who he is. But they do link to this gizmodo article:

https://gizmodo.com/the-story-of-the-most-successful-man-woman-on-reddi-5870091

That's right, The Story of the Most Successful Man/Woman/??? on Reddit

Lucky for us, he answered. Or maybe she answered? The amazing thing about the emails we've been trading back and forth is that Maxwellhill has revealed almost no personal details.

I also found this: https://en.wikipedia.org/wiki/Bukit_Larut

Bukit Larut, formerly known as Maxwell Hill (but still often referred to by its latter name), is a hill resort located 10 km from Taiping, Perak, Malaysia. Founded in 1884, it is the oldest hill resort in Malaysia.

Maybe what the username refers to. Anyway, nothing conclusive.