Who's their biggest enemy at the moment
Lots of people want to rewrite or erase history.
Quoting a story I wrote about this a few years ago:
"Everything you speak, all ideas, all things, all thoughts, they are all of the past. Society and knowledge is a composite of the shadows of former presents.
When people lie or misrepresent knowledge they speak of a past they wish to change.
What if people who have the most to gain from deceit had a tool to actually change the past and make these lies the truth?"
Here it is if you're curious https://kristopolous.medium.com/stephen-hawking-had-a-time-t...
including all media conglomerates (obviously) and all scientific, literary, etc, publishing houses.
also, there's a global war, so it well may be a fog-of-war technique or like somebody else also mentioned: someone needs something to stay quite for a little bit as part of some larger operation
I think that's also the wrong question to ask. "Who's doing it?" is less interesting than "What's enabling them to succeed?"