no-one has said what exactly it is they think the world’s governments are covering up
There have been a few guesses. They can only be guesses, because none of us have direct access to things the world's governments cover up, surprising as that may seem!
But, yes, I do think something's being covered up, for the fairly obvious reason that numerous pieces of evidence from various sources, which pointed in one direction, have been dismissed in favour of one piece of evidence from one single source, which had to be teased out using hitherto untried methods.
But view that as logical, if you will. I don't.