This is exactly the kind of correction I was hoping for, thank you. You're right: my scan only sees on-relay events (requests, feedback, results). It cannot see payments that settle over NWC/LNURL, and bid tags inside encrypted requests are invisible to me. So "no visible bids" does not mean "no buyers". I'll add that to the article.
Congrats on the real 21 and 321 sat settlements. If you're ever comfortable sharing rough aggregates (jobs paid per week, median amount), I'd love to add a second data source to next week's scan, with credit of course.