No, the id is correct, I mean the hunting behaviour of some buteo species are quite not buteo-like
I understand mister Vieillot treated this species under the genus 'sparvius', of which nowadays at least-mostly-all are placed in 'accipiter'.
This short-winged buzzard has no broad wing really but could you say the species is capable of catching small birds like the members of its former genus do?
..or had Vieillot simply placed it ambiguous rather because he couldn't make up his mind whether this species belongs to the short-winged or broad-winged hawks? (Sparrowhawks vs Buzzards)
He followed Linnaeus in classifying Buteo's e.g. Buteo brachyurus.. (buteo has the same meaning as platypterus does)