Those are all machining stations where CNC parts (likely for the instruments) would be cut. The guy in the front has a boring day ahead of him, watching the chip conveyor delivering waste material into the dumpster.
So Theranos actually got CNC machines in-house? Most companies would outsource it one of the dozens of CNC shops in the bay area (or elsewhere is large enough volume.)
They published a video of the manufacturing that showed those CNC machines, injection molding, and robotic assembly.
It's a lot faster to iterate if you have in-house machining and molding; you can get parts made or modified in <day vs weeks with an outside shop. You can also work closer with the machinists to iron out challenges.