My take is there are two sides at the higher government level. One side knows these are real, but can't/couldn't say anything, because it wouldn't be believed by most anyway, it would be a breach of national security (i.e. likely gaol for life or charges of treason for whistleblowers), and what difference would it make to those few who do believe the whistleblower? (The sort of people who would believe the whistleblowers likely already knew from believing others). The other side also knows these are real, but doesn't want to say anything because there is profit and power where people are ignorant.
However, the side which was content to keep the "alien" (demonic?) agenda secret for profit and power was planning to disclose the truth, and have a big UFO type event (even a false-flag UFO war?) to further consolidate profit and power. The other side - the good guys - are taking this disclosure by the bad guys as an opportunity to reveal the truth to people, and to sabotage the evil side's justification for further war, destruction, profit and power based on UFOs. Hence the net result of government talking about it all of a sudden - some lies, some truth - but net result of further disclosure, given the change in strategy by both sides.