I wouldn’t describe him as an anarchist. He definitely believed in state institutions, including the monarchy, albeit in the purely practical sense that it generally prevented charismatic demagogues like Hitler and Stalin from building a personality cult inspiring personal loyalty to them and seizing power.
Well, he fought with the POUM in the Spanish Civil War as part of the international brigades. I’m sure he rated the monarchy above Hitler and Stalin, but then what happens when Hitler and Stalin were beaten and gone?