Why not make a document that ostensibly validates that and bake in the fact that it was a forgery to be revealed so that all focus is on the forgery and not the facts that Bush shirked his service?
It's a brilliantly devious move and exactly the type of thing Rove would do (e.g., bugging his own office and then accusing his opponent of the misdeed, etc. etc)
https://theintercept.com/2015/10/27/george-w-bush-was-awol-b...
https://www.seattlepi.com/local/opinion/article/Rove-s-dirty...
I distinctly remember the overall landscape of the time being that the mainstream media was constantly poo-pooing bloggers and internet sources for not having the "journalistic standards" of themselves. It's quite an attention-getter to prove by their own actions that their only real journalistic standard is keeping their positions of power and promoting a preselected narrative.
In the context of all that, it seems a little weak to whine that they were set up by a Republican dirty trickster. They had just spent the last few years claiming that they were the only news source that could be trusted because they were the only ones competent enough to properly fact-check sources exactly like that.
Now if that's the story... I'm not saying Karl Rove is an angel or anything, but this seems like he's 10% bad and CBS news and every media source that stuck behind them is 90% bad.