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The argument from the “it’s a trap” article is that the service you are registering to can use attestation to ensure that you are only using passkey managers that they approve.
I have to admit that I haven’t investigated this thoroughly myself but if the protocol can be abused in that way then your only choice really would be not to use the service. If it is related to banking or government services then you may not have much of a choice.
The web api for fido2/passkeys exposes attestation information.
from https://developer.mozilla.org/en-US/docs/Web/API/Web_Authentication_API
Mozilla’s warning is funny. “Don’t use this to reject attestations from unapproved authenticators!” That’s, like, almost the entire purpose to attestation. It tells you an Apple device or a YubiKey or whatever created the credential. What else could you use this information for other than to make life harder for users using certain authenticators?
I did read that part, but like you, I haven’t been able to independently verify it yet.