The measurements are in the linked footnote, they tested the “Super Resolution” upscaling feature of Pixelmator Pro.
When normal users are thinking "faster" they are really thinking about snappiness/responsiveness, not number crunching.
https://www.cpu-monkey.com/en/compare_cpu-apple_m4-vs-intel_...
Especially when for the M1 (2x faster) they decided to use an entirely different Photoshop benchmark YET they they still show it alongside the 23x for the Pixelmator one (presumably the M4 is NOT 2x faster than the M1 there..).
That's just objectively slimy (even if mostly harmless) marketing...
Also presumably Pixelmator's "Super Resolution" and Photoshop's "radial blur, content aware scale, diffuse, find edges" are also mostly GPU bound these days? Which again.. might not be the best indicator for "performance" for most consumers.
Edit: Looking at some more general benchmarks the the i7 (I7-1060NG7) from the last Intel MBA is "only" 4x (Geekbench MT), ~2.7x (Single-Core) or 2x (Cinebench single core) slower than the M4. Picking some highly specific "benchmark" that's several times higher than that is just dishonest.
It still makes claims like that arbitrary and meaningless. What does "23x faster" even mean, it's not like there are that many people who are upgrading from an Intel MBA yet are also fulltime Cinebench/etc. testers.
> It's fair to compare
Well yes. It's reasonably fair (realistically its not like any of those people this is targeted at would feel a difference between 10x, 15x or 30x) and obviously smart.