I find it highly strange that in the space of 5 minutes: Brian posts a Truth by Gregg. Brian posts a screenshot from Lisa Mei Crowley, Brain attempts to delete his own account, Now his channel is abandoned

He said that he tried to, but telegram essentially head faked him. He describes on Truth social that the delete action appeared to work from his perspective but then his channel remained alive. Something about too big to be deleted.

Cates also mentioned that he couldn't rejoin it either. It forced him to create a new account if he wanted back on. So he no longer actually has any control over this feed is my understanding.

Two possibilities come to mind:

1. Those posts were not from Brian at all.. the channel was already taken over and someone staged the whole thing to scare everyone off and get rid of Brian. 
2. Brian utterly panicked, tried to delete his channel, which somehow marked it as "abandoned" and the site owners could now shut it down.

I see no evidence this channel is hijacked. He panicked over a post with no sauce and fled. No one else I follow has any plans to abandon their channel. Judge him by his actions, not his words.

Both are conceivable.  I just don't know why Brian would have done the latter in such a hurry.  Other rock solid researchers here are not panicked.