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Edit 1: Actually, I find the later parts of the review do not sound like advertising. In general I think it's good to give a bit of background to a review, not just whether one received something for free, but also personal preferences, prejudices, personal interest, that kind of stuff. Maybe that was a bit lacking, initially.
Edit 2: Now I had to re-read the review, even though I'm not in the market for these little in-ear gizmos. Here's my meta-critique, if that's allowed: After the a bit flowery opening the reviewer gets nicely into the technical details (freq.response, distortions, insertion depth), but then it gets a bit flowery again after "Let’s enter the Cuckoo Studio mixing space"; it almost sounds subjectivist there, although one could argue the reviewer tries to pick descriptive words that have more broadly accepted meaning. Does it help? I don't know. The big balloon graphs that follow remind me of not so well received attempts to improve high energy physics event displays in the 90s. Think jets depicted as huge colorful arrows with even bigger hats. I think the designer was very disappointed with the (lack of) reception.
There are books on data visualization, I remember attending a lecture once and getting a free copy. Of course I remember neither the author nor the title. I think he invented the little one-line squiggle graphs that unfortunately also didn't catch on.
Edit 3: Found it: The author is Edward Tufte, and he wrote several books. I think the one I remember is 'Beautiful Evidence', but more famous is probably 'Visual Display of Quantitative Information'
https://www.amazon.com/Visual-Display-Quantitative-Information/dp/0961392142 .
Ok, I think I better go back to trying to measure my tube amp now.