I don't see anything wrong with the response. If you owned a company, would you want bad press to be published?
They didn't threaten. They just politely asked that they not publish it. Sounds like they intend to get back with you on this even though the dealer ignored you. Honestly, until they were informed of the letter, was Jayco ever aware of your issues? It seems like, to this point, your issue is with the dealer not doing the repairs, not with Jayco not fixing it.
I would give them the chance to make it right before you start assuming they are trying to cover something up.
2017 Jayflight 27BHS
2013 Ford F-350 Crew Diesel (deleted)