CDPR clearly didn't fully tested many hardware combinations but this also comes from AMD recommendation
"For today’s Ryzen processors with SMT enabled, we’ve found that the vast majority of multithreaded games and applications work and scale really well when managing an active thread pool up to the number of logical cores that the processor supports. However, our experience with a small number of games is that driving a hardware thread pool with more than the number of physical cores can reduce performance, primarily due to contention for available per-core resources by the multiple running hardware threads. "
If you look at their code (AMD guidance) you will see that it goes against the general advice and basically just limits the thread count to the number of physical cores of all AMD CPUs