That really does not bode well for the upcoming fanless M2 Air.
You know, I expect this kind of remark on a random twitter thread, but I'd expect folks around here to know better.
The point of this test is: if you push the hardware to it's spec'd limits the cooling system is inadequate and the result is massive pulsed throttling.
If your claim is "well just don't use the hardware to it's full spec'd limits", then I don't know what to say other than, that's absurd. I buy equipment expecting it to meet the specs on the tin. If it can't do that, it's defective, or Apple is lying to consumers. One or the other.
The spec on the tin under what circumstances? Do you except a computer to not throttle if run in 80˚C weather? Do you except a cheap car to be able to drive at its max speed non-stop (minus fuel up) for days/weeks?
See the discussion elsewhere in the comments about intended usecase. Nowhere on the tin does it say that either of these computers will run at 100% power without any slowdown. Nowhere on the Air does it say that it's designed for 8K rendering.
There isn't anything absurd about designing a laptop to allow for bursts of power, or even heavy sustained load on the cpu OR the gpu but not BOTH.