"Has tech industry" is not the same as "new Silicon Valley." As defined by an insatiable need for new programmer blood. Phoenix is laughably far from having that. Seattle (mostly Amazon) and Austin in the last decade have come closest to that, and are still a far cry.

Silicon Valley is called that because it’s where all of the chip fabs were. They’ve not anymore, and with TSMC coming to Phoenix, I don’t think it’s a stretch to say that Phoenix is becoming the center of the microprocessor manufacturing industry in the US. The existing infrastructure here with machine shops, contractors, etc that build and maintain the fab equipment is an obvious reason why they chose this City.

Oh boy. I mean yes in the literal sense. But Intel's been in Phoenix forever, that doesn't mean Phoenix has long been another Silicon Valley.

The change is TSMC, and they specifically cited the existing size of the semiconductor industry in Phoenix as a reason.