I assume the GP comment isn't trying to suggest it's strange, just that it could be an imposter. The chain of trust could be restored going forward though, like

I assume the GP comment isn't trying to suggest it's strange, just that it could be an imposter. The chain of trust could be restored going forward though, like if TFA (or anything on that domain) mentions owning this HN account, or various other scenarios with correct order of operations.