yep. i’m seeing him on mastodon.social. It’s apparently from threads out to the fediverse only at the moment. Getting the other direction going is still a work in progress. 
I think https://mostr.pub/ has not indexed the profile yet. Or speaking in ActivityPub terms: it has not been federated yet to the Mostr instance.
On one of the Mastodon instances where I'm active (admin) I could find / fetch the profile: https://nwb.social/@mosseri@threads.net
/cc nostr:npub1wmr34t36fy03m8hvgl96zl3znndyzyaqhwmwdtshwmtkg03fetaqhjg240
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