In short: it's main mistake is that it assumes that anarchists view violent self defence, or merely simply organising as authoritarian, which is, if you look at the history of anarchism, something they regularly engaged in.

What i, as an anarchist am against in the name of authority is building up vast centralized national security states that regularly tends to produce encroachment and when someone raises their voice against that, theyre regularly set as "enemy agents" instead of solving the original encroachment. For example we here in hungary had a network of snitches to report on "any suspicious activity" which of course produced lot of unnecessary harassment of people who didnt really do anything wrong while the hidden fash - much of whom are in the political elite now - could just lay low and watch paranoia settle in.

Edit: This is my opinion tho and probably doesnt align with the radlibs on lemmy, just saw the text referenced a lot in the last few days and it bugs me, cause its just not that good imo.