Matt Taibbi tweeted evidence of it.[1]
Twitter's grounds for suppressing it were kinda bullshit, but they rightly suspected they were being used as the launchpad for a PR campaign and and didn't want to find themselves in a Cambridge Analytica-type situation and decided not to touch the hot potato.
At least put more effort into naming your throwaway account next time.
I don't think we need to read between the lines here. There were people in Twitter that felt they were overstepping things and emails from various people in the US government, but the communications team were very careful to ensure that they pointed towards their policy about hacked materials and to give themselves leeway by claiming that they were just applying an abundance of caution to the situation.