This would be a more convincing argument if your facts weren't over half a decade out of date. DTrace for Linux was relicensed under the UPL (with kernel components under GPLv2, just like the kernel) way back in 2017.
(speaking as the guy who wrote the scripts to change all the license text, though the actual relicensing was due to a lot of work on my boss's part.)
(speaking as the guy who wrote the scripts to change all the license text, though the actual relicensing was due to a lot of work on my boss's part.)