Snowcat, I’m sorry to disagree with you; if you have a good installation I’m very glad things are working just fine for you.
The link you supply shows this in their table:
Well I am using 3 Rokus in our home; all are “current models”. The Roku Ultra is less than a year old. Two Roku Premiers were purchased last fall on Black Friday.
As a part of my testing, I did take one of the Premiers and connect it to my Denon home theater amp. Same results. The Tablo app continues to state the same error message that my Roku is connected to a device that doesn’t support surround sound. And that is not a true statement.