This is all about semi manufacturing, and the position that TSMC now has in the fab space, thanks to Apple (yes, really, that's what I went on about in the previous comment). No part of my comment referred to arm, architectures, anything of the sort, just that Apple's money, applied broadly at first in the semi manufacturing space, then in a very very targeted way, took TSMC from tier 2 manufaturer to the best in class.
If you look back a few years, only x86 chips were having volume at the bleeding edge of manufacturing process. Gpus, Smartphone, everything else was one node back at the very least. Apple threw money and orders with a massive volume (iPhone + iPad is pretty close in units to the x86 cpu market, above 300M roughly off the top of my heard) at TSMC and that early + continous investment helped them fast forward their processes while Intel is still stalled in 2015.
Apple is using TSMC today (the best bits), AMD is using TSMC today (the second best bits) for the performance part of their chiplets and so will Intel tomorrow for the exact same reason. This is the relevant bit that I was pointing at.