Wikipedia points to many resources about Antifa movements, starting from here:
https://en.wikipedia.org/wiki/Antifa
And you only care to pick one narrow definition.
You got it backwards.
The only definition from that page that is not related to some extremist marxist/anarchist movement is this article:
https://en.wikipedia.org/wiki/Anti-fascism
And even that one uses the logo of the Antifaschistische Aktion. None of the other historic Antifascist movements described in that article are in any way relevant today.
Today, "Antifa" is synonymous with "Antifaschistische Aktion".
Why is it important for you to filter some definitions out?
> And even that one uses the logo of the Antifaschistische Aktion. None of the other historic Antifascist movements described in that article are in any way relevant today.
There are historical reasons that explain why Antifa caught up as a name, what logo activists use, etc. The abbreviation did not change, it still stands for "anti-fascim actions" today, or "Antifaschistische Aktion" in German.
But you are saying Antifa is synonymous, ie. equal to "Antifaschistische Aktion", not for what the words mean, but in a literal way, to restrict the definition. No matter how the name came to life, the spirit behind it is broader that the name; nowadays it is a perfectly fine shortcut for anti-fascism.
I mean, dictionaries tend to agree on this one:
https://www.collinsdictionary.com/dictionary/english/antifa