I wouldn't have thought to do it, but after seeing it, i think I could do this on a Bridgeport. I'm only so-so at machining, but I can make a Bridgeport grind with great precision in a rectangle!
I was actually thinking the same thing; a maintained milling machine can easily grind at those tolerances. Get your Z level be the most important so you don't cut too deep into the solder pads.
The being said, I'm wondering if he used something like a cheap SainSmart CNC... sounded like a dentist drill
Even so, the solder pads are surely at least like 0.05 to 0.1mm thick, across the size of the 2cm chip that shouldn't be hard at all to get level enough
