It doesn't matter, they didn't post a message like everyone else instead they made an official statement using their own privileged way. It is fine to do it on this message, I don't see the harm, but if this continues and people gets used to that blurb then Twitter will definitely start misusing it sooner or later. I don't think that companies should have this kind of power to influence public discourse, I might not agree with Trump but I really think that we need to limit the power big tech companies have.