Just the usual audiophoolery making claims with nothing to back it up, and responds like you when asked about measurements. We’ve seen this many times here.
I think people are misunderstanding or misrepresenting what Audyssey Evo does. The over-zealousness of the fans doesn't help convince anyone either.
All I can say is that I used for a few years a Denon 6500 with Lyngdorf 1120 stereo amp in htbypass mode for the front speakers. The sub was attached to the Lyngdorf. Denon sw was set to "none", fronts to large so that all bass/LFE got sent to the 1120 then to the sub. This involved running audyssey on the Denon, roomperfect on the 1120, bypassing audyssey on the fronts and then manually level-matching.
I'm no expert and only used a phone SPL but my levels were all over the place.
I decided to connect the sub back to the 6500 and run Audyssey then the Audyssey One script and wow - it breathed new life into my system. Clearly I must have been doing something wrong with the way I integrated the 6500+1120 previously because I went from barely watching movies to re-watching all my favourites just for the sound.
I then thought going from Denon to Anthem would be an upgrade, but as I wrote before on this board I didn't hear any improvement on the Anthem, didn't like the fan noise and other quirks and rather than persist with getting a random guy on AVSF to tweak my ARC file I decided to get an ex-display A1H
Knowing I had the Audyssey One script that would auto-optimise my Audyssey (levels, sub integration etc) was a big selling point. I knew I would keep the A1H on the first listening test.
What Audyssey One is, is an easy way for a non-expert/master user to optimise their existing audyssey file in under 5 minutes.
Could you get a better result doing everything manually via Mult-EQX if you know what you are doing? most likely.