I have no alts on this site (I just take the negative karma when I have something nice to say about crypto), but it still provided a list of 20 accounts, some with higher similarity scores than pg had (in the example).

Maybe I should be friends with these people then?

https://stylometry.net/user?username=cableshaft

EDIT: Did a quick cursory glance at the top five on my list, and despite pretty different subjects they talked about I can kind of see the stylistic similarities.