Do you have a tour that includes cruising this river?
I think you misunderstand this forum. You are not communicating with the Rick Steves organization, but with other travelers sharing their knowledge. People from the Rick Steves organization do monitor it, but mainly just to step in on rare occasions when a discussion goes off the rails.
But to your point, their are cruises that do the Mosel, mostly for limited stretches. as the many locks slows progress.
A couple of resources:
https://www.k-d.com/en/boat-tours-moselle/
https://www.moselrundfahrten.de/en/