1080p and 1440p on Steam account for 75% of the surveyed userbase. Not sure which market segment games at 720p on an recent hardware, not that this test is that relevant to gaming.
No arguments here, except to say that in terms of efficiency while gaming I believe the test is relevant.
There is a lot of talk on here about efficiency with every new CPU release, so knowing why review results conflict when it comes to efficiency has value. Alder Lake especially has been the subject of a lot of efficiency related talk, so knowing that using an AMD GPU has the potential to be more efficient with Alderlake while gaming than a Nvidia one has value.
This is particularly relevant for anyone buying a new system.
If there wasn't so much talk about efficiency, and Alderlake wasn't the subject of so much scrutiny when it comes to power draw, then I agree the test wouldn't be that relevant. But people do seem to care.
The test was conducted at 720p to highlight the issue and ensure the CPUs were being tested, but the reviewer notes that the trend continues at 1080p which is the resolution the overwhelming majority of gamers use, if the Steam hardware survey is to be believed.
As for the statement "No one across three quarters of the world games at 720p"
I checked the steam hardware and software survey as you did, and I noted that for every two people playing at 4K there is at least one person playing at 720p.
A not insignificant amount of people.
I can't see any breakdown for where the survey results are coming from, so being able to separate the results by region isn't possible as far as I can tell. For both of these reasons I ruled Steam out as the source, and I'm assuming the statement is just incorrect.