Technical question

@p

Christi Junior's reply with someone from an instance named immerge.to (or something like that) brought that person's profile to my attention. As his pinned post he implies being over a year on the fedi, yet I can only see two or three posts, is this a federation issue? And is it intended? (from whichever side). I also want to say that a noticeable amount of replies on my home feed (from others to others) go to people invisible to me, which is unfamiliar.