N_, there were zero political points being made at this protest, absolutely nothing about economic policy. I don’t know how conflict broke out, but the protest did not appear to be committed to non-violence, eg. the video I linked shows a “Gestapo police” placard, and another shows protestors engaging violently with police.
On what basis do you suggest this to have been an “anti-fascist” protest? The protestors appear merely misguided by antiscience, without any coherent political stance at all.