Anyone familiar with #FIDO2 / #Passkeys could you please #help me here?

Accoding to Yubico docs on Passkey, the client/client device uses #CTAP2 to communicate with platform authenticators. This sounds a bit strange to me, aren't there internal APIs on the platform that are called here? Isn't CTAP2 exclusive to #roaming authenticators?

#advice #thaks

https://developers.yubico.com/Developer_Program/WebAuthn_Starter_Kit/Platform_and_Roaming_Authenticators.html