We're not most "audiophile" sites. The facts of the measurements are posted without concern for other factors. Subjective reviews are posted for many reasons, some not putting a products real performance as the top priority.
The mind is easily fooled in a sighted review. Many things may influance what you hear, being bias by all that stuff you've read, heard or been told. Only under tightly controled DBT's can true differences begin to be sorted.
First just click Edit at the bottom of your post.
That big a difference in dialog intelligibility could only be attributed to speakers unless some electronic product is mis-configured or broken.
Discovered the "edit" feature for posts, I can now see it in a browser, not on my Android phone which is what I was using originally.
I didn't have any predisposed notions of NAD, actually I have never heard of the brand until I looked at the receiver driving my in-law's home theater after being blown away by the sound quality that I had heard over the course of several movies. It wasn't easy, the audio rack is in a closet without a light, so I had to go into the closet and flip on my cell phone light. Normally I would not be so inquisitive or intrusive but I had never heard any home system like that, so I had to check it out. Incidentally they have a NAD 758 V3 that came with the house when they bought. They have no clue about audio or video products.
As for dialogue clarity I can say from personal experience in my own living room, trying various speakers and receivers, as well as room correction, EQ and so on, that the clarity of dialogue produced by the NAD T 757 V2 is much, much clearer than what I hear coming from a couple of respectable Sony receivers. I think it has to do with power. I have fairly large speakers which is why I wanted to try the NAD in the first place, (I was searching for a decent Harmon Kardon that had HDMI, unfortunately somewhere between the time I purchased my PM660 (still works) and now, they stopped making decent receivers and now I don't think they make any at all.
With all due respect to the forum, the founder, the testing and all that goes into that, I politely disagree that basing "audio reviews" simply on measurements is not much help for an avid electronics consumer looking for performance reviews. Simply measuring them seems ridiculous to me. Aren't audio products meant to be listened to? That would be like Car and Driver simply judging cars based on Horsepower, Torque, Rolling Resistance, etc. Makes zero sense... You would need to drive the car to know what its all about. I think that audio reviews with listening is not fair at all to any of the manufacturers of these components. I've breezed over a few reviews and they are all the same - "oh look how bad this xyz measurement is, I cannot recommend this receiver"... LOL really? That coming from the same person who doesn't hook up an HDMI cable because they "don't have time"? C'mon...
And what sort of audio review site would not test over HDMI? I happened to find a review on a Sony ZA1100ES which is the little brother to my ZA810ES and the review was better for the Sony than the NAD, which is crazy enough, but the tester starts with analogue and SPDIF cable for testing? Its 2021 who's even listening to anything analogue anymore except for a niche' market still into vinyl and who's not using HDMI ARC?
This is a weird review site. I'm sure there's some value to it, but for what I'm not sure.