The vendor in question is private only, and his alt contact market is Nucleus. I won't be using it, we just do direct deals. But I need to get in touch with him.
Does Nucleus have some URL code to take you to desired vendor profiles like Agora? Ex. .onion/vendor/VendorName#
When you search their name, it defaults to an item search. But there's a tab up top that says 'user.' Just click on it and wait. It took me a second too.