Ah, thanks, I think it makes sense now. The use of hyphens is confusing too. I would have preferred either:

> Passkeys allow you to go passwordless: rather than a password that can still be phished, you get a strong credential that syncs securely across your devices, using your chosen password/passkey manager.

OR

> Passkeys allow you to go passwordless — rather than a password that can still be phished, you get a strong credential that syncs securely across your devices, using your chosen password/passkey manager.

I don't think that I've ever seen credential in the singular (though the dictionary says that it is a thing)