That is not surprising at all. But, you and I are capable of looking fruther.
Why do you think Antifa (those in the know about their organization's purpose) would choose the name of a communist organization, choose to use its slogans and imagery (e.g., the two flags, the raised fist symbol, both symbols of Antifaschistische Aktion, the German communist movement)?...because they oppose the things that the original Antifaschistische Aktion organization supported?
You can't seriously argue that.
If you use my/their definitions, their actions make sense.
If you use your/modern definitions, then their actions make no sense at all, because you are left with people running around the streets acting in accordance with the modern definition of fascism, while claiming to oppose it.
Antifa really does believe Freedom (Capitalism) is Slavery (Fascism), and the Ignorance of the modern US voter on this point is their Strength, because they can continue to grow without people even knowing that they oppose their views.