If Im reading this correct nostr:npub1jmqznxuxxxrnaj3m7esjrwauxmvg742ltj0gsgumlmtxukzq99yqfrl6g5 created his keys using coracle.
From looking at his profile from two apps other than Damus, the relay list limbo is not an issue (rather damus does not currently recognize the relay list kind coracle uses. I created a damus issue for this).
I see no need for Mitnev to ditch his keys.