dvice, you know your stuff for sure. I've borrowed some of your due diligence even. RMSL fumbles might be honest mistakes by out of touch management. There is a market for a cheaper breath easy CPAP. Deltawave could be a great product promoted and managed badly in todays marketplace.
This is non-final which means RMSL can respond..they found out about rejection on 10/21/2020 yet stated they stated they "finally received office action" on Nov. 20, a month after they were initially notified.
There are 19 claims of patentability. 15-19 claims are being withdrawn from consideration. Of the 14 left, 10 of them are unpatentable - see pages 1 and 5. Here is the NON-FINAL REJECTION letter so you can review it yourself: