You need to read more foreign press. In Mexico is usual to call my metropolitan area, Guadalajara, as the "Mexican Silicon Valley" for all the IT and comms related companies that settled here. We used to have delivered to our Sun shop every year the "Silicon Valley xxxx year" calendar, so clearly, at least for publicity purposes, the term "Silicon Valley" was a metonym for the IT industry. In fact, your post and the one from the great grandparent are the first ones I have seen nitpicking about the term in 22 years.