Server CPUs are hitting those numbers already for many years, including the AMD. The thing here is that Apple optimized their core for a different workload than the rest. I don't think there's a secret sauce AMD isn't aware of given their other line of CPUs - they know how to achieve it.

In multi-threaded scenarios, for example, M chips are not better at all and AFAICR are worse than the Threadripper. So, a different trade-off really