The company Sporton Int inc who researched the FCC compliancy for FP approved it for the whole range indeed in 2019 here. So I would say you doubted my finding correctly 
I was quite fascinated by that paper, and just now managed to have a decent connection to my FritzBox 6490 standing in the same room up to a distance of 3m explicitly on channel 116. The FritzBox claim a connection of 300-500Mbit/s depending on distance (and during active usage, so I trust these values). This drops heavily once I have just one wall in between. Combination of wall+distance ~5m makes it impossible for me to even establish a connection on channel 116, which was the sole research I did for my earlier post. I don’t experience that bad quality for every channel above 100, but it is not the only one either.
I think it would be quite interesting to know how other devices with same chipset behave on channel 116 in comparasion to channel 52 or so on the same device.
BTW, as here is mentioned to connect to public 5GHz WiFi it is not so clear, that we are all talking about indoor use only.