Where are the posts from the 1000s of other users using RAAT devices? RAAT is a standard protocol, they shouldn’t be doing anything special on the server side just for Devialet. There is something wonky with Devialet’s network implementation in my opinion, not necessarily RAAT.
I would have hoped that Roon’s certification process would have been intensive or covered enough network topologies to reveal it as it obviously affects many Devialet users.