The Software Freedom Conservancy legal analysis of RHEL and GPL that OP links to is the most interesting part to me. https://sfconservancy.org/blog/2023/jun/23/rhel-gpl-analysis...
Wishy-washy language there about skirting lines doesn't make that a very good analysis. You can use others' GPL code in your products and charge money for it. You have to "publish" the GPL'ed sources (and any sources of yours that derive from GPL'ed code) on demand -- publish as in: if someone asks, you have to give it to them, but there's no requirement that there be a public download page or anything like that, and…
This is why we have GPL 2 and 3, for example.
Disclaimer: I work at Red Hat, but nowhere near RHEL.