Like @jack@hexbear.net said, it’s formally correct but very inappropriate and a weird phrasing (I’d still call that shit English even if it’s technically valid syntax). They’ve used a passive, third-person way of talking, instead of saying “I’ve just learned” or “We’ve just learned”, it’s stated like an objective scientific report: The fact has just been learned! In fact the whole tweet sounds like an attempt to be professional and serious, but with occasional out-of-place lapses into emotional language.