As far as I can tell, these credentials are no different from existing WebAuthn credentials. So yes, you should be able to use any authenticator that implements the protocol, including the Yubikeys that already exist. This isn't like OAuth where each company has their own separate login flow that sites have to implement.
The parent poster that ryukafalz replied to had an anecdote regarding being locked out of their apartment because their cellphone died, that was the essential cause of their antipathy, and the quoted text mentioned 'enjoy shelter' as one of the things you might need a cellphone to purchase in the dystopian future.
