Fair. But I think that statement isn't meant as a strict and precise definition (eg. Stanford Encyclopedia of Philosophy or whatever), more like a "gateway" description directed at those who associate anarchism only with utter chaos and "burn the house down" kinda attitudes.
Now, I'm aware that when you need to say something is "gateway" that's a bit of a red flag, i.e. "milk before meat" (describing something as friendly and innocent at first, then only later showing the more aggressive indoctrination) is exactly what cults do. Having said that, I'd grant that the late David Graeber is quite the straight shooter so I think he's in the clear here.
Now, I'm aware that when you need to say something is "gateway" that's a bit of a red flag, i.e. "milk before meat" (describing something as friendly and innocent at first, then only later showing the more aggressive indoctrination) is exactly what cults do. Having said that, I'd grant that the late David Graeber is quite the straight shooter so I think he's in the clear here.