Clearly I didn't misread that. It's literally the very first bullet point?

But then, email always was the only authentication. On any site, click "forgot password" and promptly they send you a reset password link. Very few sites have a challenge question.

The first bullet point mentions phone number.

- Enter an email address or phone number

Thats not just email, that's also SMS.

> It's about email as single factor auth, which has become very trendy of late

I must be in the wrong bubble, I have not encountered any site that does this since the 2000s. It was a minor trend around then IIRC.