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I thought it is formally supported by Canonical, just not without Pro. They said it used to be best effort but with Pro it has an SLA right?

So do Canonical get there hands dirty at all and fix any code, or is this straight-up gatekeeping?

This is Canonical getting their hands dirty and applying their own patches faster than the package maintainers. If the package maintainer release a patch then that is applied like normal, no Ubuntu Pro required.

Does this mean you do get support for these packages if you pay? Or are they still best effort?

They actively patch them, which is something even RHEL doesn't do(Rpmfusion not supported at all)