Android 7 is end of life, no need to mention it. But if it mentioned Android 10, then yes, not Pixel specific.
I’m just skeptical. For work I am involved with security as well. Not every software version is affected by the same bugs, sometimes it’s just in one major version or even a minor version with feature X enabled or module Y loaded. That’s why I find it hard to believe that Google fixes bugs for their Pixel and not include them for other Android versions. Unless of course they are on a different branch. Then the patch doesn’t apply. Otherwise there is no reason to not include it.
It could be though, not saying it’s impossible for Google to make their own devices better than others. But just listing CVEs that are included for Pixels is not the proof that convinces me. They run different software than other Android 13 devices. And different than Android 11. That they run the same software by name doesn’t mean they run the same version.
Anyway, if you have concrete proof I would like to read it. But this seems like an educated guess. Which again, may be true. But is not convincing for me.