The guy is measuring BB shells. Incidentally, he doesn't say how he is doing this in what seems to be his back bedroom. But measuring is not how the industry tests its BB shells because even with BB30 there is actually a tolerance range. With PF30 there is a wider tolerance range.
The industry uses 'go' and 'no go' tools. I believe FSA market these.
Go/No-Go gauges are a less expensive and faster (the faster is important when you are testing 100s of frames a day) way of doing what he did. It also tells you less information. I would like to know what kind of measuring tools he used as well, but not using a go/no-go tool would be a sign of a well designed test. Any bore measuring tools or nice enough height gauges, a granite table and some good technique are plenty good for doing what he did. A 100k+ CMM would be overkill but would also do it in a more repeatable and programmable way.
I would be very very surprised if the 'Industry' doesn't use a CMM to test samples they pull out of the line for more thorough QC checks. It's pretty standard in most industries where moderately tight standards are held.
I disagree with his views on CNC machining. Good machine shops use automatic tool wear checkers that automate the process of applying a wear offset to keep parts in tolerance. I can guarantee that the races on the bearings he sells are made w/ CNC machines and then ground using an automated process. Even competent shops that don't use an automated wear offset will check the occasional part and apply an offset at the machine for a tool to keep tolerances tighter than spec'ed.
Just because he is in his back bedroom for the videos doesn't mean he doesn't have access to these types of tools. It just means he doesn't have access to a nicer video studio.