Most of those links come from two sites, one ford forum and the videos from the same guy. If you go to any forum dedicated to a single subject, whether vehicle or anything else, you will naturally find posts about problems experienced and someone seeking help or sympathy. Same if you go to a specific RV brand web site. So don't put too much into those as there has been no widespread postings about problems with the new Ford diesel.
Except for a few who post here, there is rarely anything posted here about a problem with the new Ford engines. And the vast majority who have them have nothing but praise for the 6.7.