For collusion to be noteworthy there still has to be a crime committed. The allegation in the Trump-Russia collusion case is that they conspired to have foreign operators influence the election. This would have been an illegal act that they colluded on.

There is nothing illegal about requesting review of tweets even through special channels. If Twitter actually has evidence of an illegal act to coerce the review then they should probably rehire whoever was coerced and file suit.