It's the same as "Google Authenticator" being used instead of TOTP. I think it's reasonable for apps' documentation to meet users on their turf to aid understanding.
This is because the fido2 libraries follows a lot of defacto standardisation: either to match yubikey or windows hello as the only real implementations in the wild. Fido2 ctap extensions would support all the use cases of the new device except you won't be able to use them e.g. in windows because vendors are ignorant about all the openess to push their own agenda.