Epyc 1 was NUMA within the socket while Epyc 2 is officially UMA within the socket (although not really). Unfortunately Epyc memory latency is much higher than Intel so it's fair to call it uniformly slow.
Yeah, I actually was not so happy with the benchmarks because the memory access latency is not all that good... for most of the workloads that I care about, I don't know that the Epyc will be faster than a Xeon.