In that case, I am from the future and 126 years old (edit: and every other claim becomes truth too).
Let’s assume DIY’s statement is true.
- We know that DIY does not have an X account, as it has been assumed to be true.
- Therefore, the two-part statement "DIY does not have an X account or Sativied is from the future and 126" must also be true, since the first part "DIY does not have an X account" of the two-part statement is true.
- However, we know that DIY does have an X account (which he signs in to with google)" so the first part is false, and hence the second part must be true to ensure the two-part statement to be true, i.e., I am from the future and 126 years old.
Of course, plenty of reasons to allow users to sign in with Google or Apple account, one of the best is illustrated by DIY‘s comment: people don’t have to create a separate account… however, that’s just perception from the user’s point of view. To show why it doesn’t compute, the complete sentence would ‘technically‘ be:
I don't have an X account either, but sign [into my X account] using my google account.
It uses Google account to identify and authenticate, it’s not actually a substitute for the account at X. The initial button isn’t misleading either, it’s “Sign Up” with Google, as in sign up for an X account to which you can automatically sign in with your google account’s credentials.