It's true that Red Hat does pull in changes from upstream for several subsystems of Linux. It's genuinely a frankenkernel mixed with code from 6.3, 6.1, etc.

But you're still beholden to what the Red Hat maintainers are pulling in and focusing on. It's still not a general follow upstream wholesale.

You can see and track what UEK is doing by looking at their Github: https://github.com/oracle/linux-uek/commits/uek7/u1