The content of the complaint is all that matters, and it should be judged on its own merits. It never matters who said what, and attempting to make it matter is ad hominem fallacy; it is what is said that matters.
That said, I can't quite fathom why Twitter's cybersecurity matters any more than the cybersecurity of any of the myriad of online forums, HN included: the "data" simply isn't all that important; it is all public, it is all talk, and talk, as we know, is cheap. Say Twitter is completely overrun by foreign state actors who delete everything. The outrage is going to be minimal. "Dang, I really enjoyed mouthing off on Twitter. Oh, well."