alt Hacker NewsReveal = show something that was hidden previously.
Seems like the appropriate word to use about a source code leak.
The words proposed by you are suitable for describing the consequences of a revelation, while no longer containing any hint about their original cause, so using them would have lead to a more verbose sentence for delivering the same information.
It wasn't hidden previously. It was fairly well-understood.
The CC source doesn't "reveal" a single thing about anything other than Anthropic internals. It says nothing about the industry at large, certainly nothing new.
And this:
doesn't make any sense. There is no "revelation" here. And the word "reveal" contains no connotations whatsoever about the "cause" of a "revelation".