Look at the single core results and you'll see the per-core performance isn't close at all. Depending on what you're doing, this may be a lot more relevant than the number of CPUs you can fit into a single socket.
It's unclear how NUMA-aware this benchmark is. The single-socket Intel results are not really that far off from the dual-socket results, which suggests it's not very NUMA friendly? Or there's some other factor in play there. But if it's not NUMA aware, and is suffering from that, then it's not really that surprising that 64 physical cores are faster than 18 physical cores, even if the later are ~2-3x faster cores.
It's unclear how NUMA-aware this benchmark is. The single-socket Intel results are not really that far off from the dual-socket results, which suggests it's not very NUMA friendly? Or there's some other factor in play there. But if it's not NUMA aware, and is suffering from that, then it's not really that surprising that 64 physical cores are faster than 18 physical cores, even if the later are ~2-3x faster cores.