There is more to come though. As he says...
7. Slowly, over time, Twitter staff and executives began to find more and more uses for these tools. Outsiders began petitioning the company to manipulate speech as well: first a little, then more often, then constantly.
That statement corroborates The Intercept's reporting on the subject. We know that at some point DHS and White House officials began meeting bi-weekly with Twitter execs. We know from ongoing lawsuits that these officials went as far as to target specific individuals.
I doubt Taibbi gives us anything that we don't already know. My guess is that it will simply add evidence to the stack.
As I've implied at least 10 times in the last couple of weeks, this is not a partisan issue. This is bad for everyone.