That one looks a bit... pandering to what we'd expect, honestly. Too good to be true.

This, here, looks somewhat more plausible https://itsgoingdown.org/forming-an-antifa-group-a-manual/

And their tactics describe quite closely how they operate:

4. Doxxing

After doing your research, present information about racist organizing in your community. The information you release should present enough information to convince an average reader that the target is clearly a racist. Information should include, if possible: a picture, home address, phone number, social media profiles, and employment information. Be sure to include organizational affiliations and screenshots showing concrete evidence of racist and fascist views. Follow up the doxx with a pressure campaign: call their work and try to get them fired, and inform their neighbors through flyering or door-to-door campaigns.

When you present your intel, you’ll have showed your hand, however, and generally it’s difficult to collect more after that. Also be aware that you will enrage your target by naming them: you might have been ignored as a public group for a year doing antifa stuff, but once you refer to a local racist by name, they will fixate on you.

Make sure your intel is correct. You will lose credibility and create unnecessary enemies if you list a home address or work place that the fascist is no longer associated with. The majority of research can be done online, but some things can only be verified in the real world.

5. Event shutdowns

Pressure venues to cancel racist or fascist events. Make sure you have your dossier on the subject prepared beforehand to present, as the first question will always be “How do you know they are a racist?” Approach venues with a friendly phone call, as often they are not informed about the politics of events at their space. However, if they don’t cancel immediately, they will almost always need to be pressured. Collect phone numbers, emails, and social media contacts and call for a shutdown. (We have found that it is helpful to make easily sharable graphics and short videos.) Threaten a boycott of the venue if they event goes on, and follow through on this. In Montreal, one racist concert was cancelled after antifa physically blocked the entrance.

And actually, that whole website from the above link seems pretty in-touch with their goings-on.