Interesting. As this article mentions that the OS runs well on AMD CPUs, as well, I wonder if the OS isn't serving Intel CPU sales as originally envisioned.
But they didn't say that it benefitted AMD CPUs as much or more than Xeons. Furthermore, it started out, back when Intel was the only one with AVX-512. Nowadays, the big Intel Xeons still have AVX-512, but they also have AMX and like half a dozen other hardware engines that need to be catered for with special drivers, library support, and OS tuning.
Another thing to consider is that Intel has non-x86 competition to worry about. So, if Clear Linux gave it an edge over ARM, then it's still valuable even if it's helping to lift AMD, as well.
Hardware companies traditionally shy away from OS development, though,
One of their former CEOs said, a couple decades ago, that Intel had made the mistake of depending on Microsoft to catering for its hardware. It was made in the context of Intel starting to invest in Linux support, where the idea might not have been so much to undermine Microsoft, but at least to show what's possible and perhaps to serve as a better test vehicle for its new chips.
In the end, such optimization efforts probably helped Linux dominate HPC and the cloud, both of which had subsequently been very profitable for Intel. Who knows: if Intel hadn't played an active role in optimizing Linux for x86, maybe POWER would've eaten more of their server marketshare.
(Says the ex-owner/user of three separate versions of OS/2...😉)
That's why Linux is brilliant. No one company is shouldering the whole burden of it.
Also, IBM sold OS/2 as a software product that you could install and run on any PC, regardless of whether it was IBM-branded. So, that was really a pure software play they tried to make. It almost worked, until they lost the court case over whether they could provide binary compatibility with Windows. IBM simply got out-lawyered - OS/2 didn't lose on merit.