Is it explicitly a formal identity verification? No. It verifies that you are either the owner or affiliated with a registered domain.

Can it be used for identity verification? Absolutely. No one else is verified with EvanPrim.com but me, so it’s a pretty safe bet that my account is verified as owned by me.

As for third party services like nostrplebs.com, any and all verification processes are still evolving, as it’s a service that as only existed for a few weeks.