I do think that we need more standard procedures around what a reset/authorize new device looks like in a passkey world. There's a lot about that process that just seems like it's up to the implementer. But I don't think that invalidates passkeys as a whole, and most people are going to have access to their mobile device for 2 factor no matter where they are.

Incidentally I have no idea who this is or whether his opinion should be lent more weight.