The FX series has high core counts but much lower single thread performance vs. Intel chips. For example, the FX-8350 has a respectable passmark score of 8949 which puts it in the ballpark of an i7 3770, which came out 3 quarters earlier, but its single thread passmark rating of 1509 is significantly less than 2069 for the i7 3770. The FX-8350 initially cost around $200 and the i7 3770 cost around $350. So the FX wasn't ever really competitive with Intel and certainly never crushed an Intel server chips.
Don't forget the i7-3770 has half the TDP of the FX-8350 despite the overwhelmingly superior real-world performance in every meaningful metric.
I'm not sure in what world anyone could think the FX series ever "dominated" Intel chips at the time, much less current ones, in the datacenter -- unless they are literally delusional.
https://www.cpubenchmark.net/cpu.php?cpu=AMD+FX-8350+Eight-C... https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i7-3770+...