Do I think Asrock are particularly good at killing CPUs though? Yes.
I do not think around 200 (claimed not verified) failed CPU's out of around 2'000'000 AM5 motherboards is a significant number, so cannot agree that Asrock are particularly good at killing CPU's. But they are currently the best, in 2024 that crown went to Asus when they had the same issue with 7000 series.
Failure rates of 1% are considered great for motherboards according to Google,
One of the problems though, is simply people blaming Asrock therefor it must be Asrock to blame, despite these users using 3.15 and playing with Bios. Out of all the failures, not every single one was due to Asrock. We know AMD had a part due to AMD's initial response and public anouncement of refunding. We know Asrock had agreed Bios settings before hand with AMD and AMD's CPU's failed with the aproved settings. We know Asrock had repeated Bios revisions to try and solve this, and we have had less failures with recent bios updates. That the companies making the CPU's and Motherboards cannot pin the problem down makes both a questionable brand.
We do not have any failure figures on new recent batch AMD processors running on bios 3.40 or later and no other bios having touched the CPU. It would have been nice to have seen some verified figures, but we won't see any if there is only a couple of hundred claims since May.
The reality is it would take thousands of failures to be a problem, and it would have to be a consistent issue for reviewers, content creators and system builders and buisinesses. Which is not the case, it's primarily an issue for enthusiasts who use Reddit.
There is probably more chance of a currently more expensive memory kit needing returned due to failing memtest than an Asrock MB killing a 9000 series CPU.
Though I do wonder what will happen with these Asrock motherboards and AMD's next range of CPU. Will it be Gigabyte or MSI causing explosiions next round or will Asrock retain the championship belt!