What's the price?
I hate these hype pieces. The issue isn't if Power is 10%, 20% or even 100% faster. It's $$$/thought in AI that matters, so two X86 with GPU accelerators may still trounce a Power unit but still be 1/2 the cost.
Anyway, this isn't really about the CPU engine. The real speed-ups are in NVMe and NVMe over InfiniBand. Here, the playing field with X86 is level ... both can have Mellanox NICs!