This is tenuous, but there is a connection here. First of all, we're not talking about modern Antifa, rather the German Antifaschistische Aktion circa 1932. From wikipedia:
'Antifaschistische Aktion was established by the Communist Party of Germany (KPD) based on the principle of a communist front and its establishment was announced in the party's newspaper Die Rote Fahne (The Red Flag) in 1932. ... (skip several paragraphs) ... Occasionally, the KPD cooperated with the Nazis in attacking the SPD and both sought to destroy the liberal democracy of the Weimar Republic. ... In 1931, the KPD under the leadership of Ernst Thälmann internally used the slogan "After Hitler, our turn!", strongly believing that a united front against Nazis was not needed and that a Nazi dictatorship would ultimately crumble due to flawed economic policies and lead the KPD to power in Germany when the people realized that their economic policies were superior.'
The above is in agreement with Adams' defense of Adams' statement, as cited in his youtube episode #1120. He admits he was baiting trolls, and was (but did not admit) that he himself was trolling.
Saying that Antifa was allied with Hitler was a gross exaggeration; any "alliance" between Antifa and Hitler was a common enmity to capitalism. A reasonable argument can be made that Antifaschistische Aktion did help Hitler rise to power. I am not competent to evaluate that argument.
This sort of flame bait was something that Adams engaged in frequently. I think it did him more harm than good.