That's a good article. One minor correction:
They list three possible modes to hook up:
1. ANT+ speed sensor → ANT+ USB dongle → PC or Mac
2. Bluetooth speed sensor → Smartphone with Zwift Mobile Link → PC or Mac
3. Bluetooth speed sensor → iOS device (iPad) or Mac (2012 or later with Bluetooth 4)
I added the part in bold. It may also be true of more recent PCs, so worth checking.