I need some context.

Linux developers have made improvements to specific parts of the IO sub system. These changes will give Linux better IOPS performance.

Prior test are quoted at 3,8 IOPS. They ran the old code on a MD Ryzen Threadripper 3970X at 3,8 IOPS.

Now he got a better / fast CPU AMD Ryzen 9 5950X and it achieves an impressive 5.1M

It seems to me that the new test does not make it clear how much code changes helped and how much a new CPU helped?

Running the old version on the new CPU or the other way around would make it easier to compare?