Marcan42 accidentally posted on his twitter as Asahi Lina, and on screen Lina has accidentally shown things identifiable to Marcan (usernames, logged in mastodon account).

But he clearly doesn't want to be linked/equated to her for whatever reason, so I don't know why GP brought this up beyond stirring up drama.

There was drama with Lina and another person in the vtuber hacker space who directly referred to them as marcan.