Stream Sniped by a Paid Chatter?! - Kaneko Lumi (Phase Connect) [VTuber Clip] 

Lumi getting groomed by chat just like she always wanted.

As in, a member of chaaaaaaaayt that was paid to throw the game against the lemon3

A paid chatter is a meme, it's saying that someone was paid to say something nice about the streamer or to make them look good.

I assume she meant "paid actor" because it's usually what streamers joke when they get easy or unlikely wins or kills