AMD Quietly Lists 31 New CPU Vulnerabilities, Issues Patch Guidance

https://www.tomshardware.com/news/amd-discloses-31-new-cpu-vulnerabilities

Note: 3 of them affect consumer hardware, the other 28 affect Epyc.
They also don't seem be CPU vulnerabilities like side channel vulnerabilities, but rather vulnerabilities in UEFI, SMM, PSP etc.
So imho, there will be no performance penalties due to new mitigations, as the affected parts will receiver a proper patch that fixes the issue, compared to the side channel vulnerabilities that cannot be fixed, only mitigated.
The downside being that you need a bios/uefi update from your manufacterer to fix these issues, instead of being able to get new microcode from you OS depending on the OS.