Intel’s position amounts to cage rattling and vague insinuations that efficient execution of x86 code is impossible without hardware support. That’s nice, and their ham-fisted approach already hurt customer choice in the past (Transmeta and nVidia Denver, before the later implemented the Arm ISA) but the Windows on Arm solution is completely software and not coupled to any specific Arm chip implementation.
It usually takes 4-5 years to design a chip, and if Apple planned on releasing the Mac CPU in 2020, well...