Yes AMD results are valid AFAICT.
I'm not even sure it's a bug TBH as despite them saying some overclocking/benchmark programs force HPET on it seems to be more a snafu of Anandtech's own making.
Maybe I'm being to harsh on Anandtech and forcing Windows to rely on a single timer is a common thing for overclocking/benchmark programs to do but IMO I'd consider that to be a bad practice, it's not the usage of HPET that i take issue with it's the forcing of Windows to only use a single timer.