I can’t really respond to the NYT article you posted, it requires a subscription to view

When it comes to the Goebbels diaries, it appears that Goebbels himself knew (or at the very least believed) that Katyn was done by the Bolsheviks. Although the massacre was very useful to him for propaganda purposes. At least that is the impression I get by skimming through his 1943 diary (published sometime in the 90s)

On April 14, 1943 he wrote

We are now using the discovery of 12,000 Polish officers, murdered by the GPU, for anti-Bolshevik propaganda on a grand scale.

Evidence of Soviet guilt was provided in the 90s - Beria’s letter to Stalin comes to mind. Recent investigations into the mass graves done by polish archeologists showed that the victims didn’t have anything made after 1940 on them.

The people repeating this version of the story now are all the usual suspects: NATO, bourgeois journalists and Polish nationalists.

No, the “people repeating this version of the story” are not just a handful of western propagandists and nationalists. This story is accepted by everyone except for a few MLs.

I don’t see at what point exactly that person is doing “apologia” for the nazis. I am also not aware of any evidence suggesting that the polish people killed in Katyn were “nazi collaborators” as you are trying to claim and it seems like what you’re trying to do is thoughtless apologia for a real atrocity commited by the USSR on polish people. Yes, killing 20k people is nowhere near as bad as the nazi atrocities - that doesn’t suddenly make it justifiable.

I’m sorry if what I’m about to say is completely wrong, but I disagree with calling Fox News liberal. I don’t think words have absolutely constant meanings, their definitions can change if people start using them in a different way. That has happened with the words “liberal” and “conservative” where they are used to refer to a different set of political positions than 200 years ago (mostly because people advocating for feudalism and aristocratic rule are few and far between nowadays). So I think that Fox News would be “liberal” in the original meaning of the word, but not in the current understanding of the word.