I build my own wheels because I get satisfaction doing it and you get exactly what I want in hubs, spokes, rims, but I am under no illusions that my builds are any better than a quality built machine wheel, there are probably some cheap built machine wheels but not at the higher end of the market, the technology available nowadays is very accurate.
Accurate maybe, but still has some problems. These machines cannot bring spokes up to high tension. The machine cannot sense spoke wind-up like clever humans can and thus cannot compensate for it. They machine also starts to hunt for the right number of nipple turns as the tension is set higher.
That doesn't mean these machines don't have a place. Humans just cannot build enough wheels to cope with demand. Good wheels are hand-finished. Humans do the last bit of tensioning.
The video is unfortunately just an amateur cellphone one but I do think I saw a section where the spokes were stress-relieved, one by one. Look at 0:54. That piston that presses on the spokes is doing a stress-relieving job. The voices in the background describe it as press-stressing, which is a different concept altogether. That's a good sign, but I don't see any evidence of a process whereby the spokes are untwisted. It may be that the tension is so low that that process is not needed. That's a bad sign.
I've seen another machine in operation that stress relieves the wheel quite violently. The rim is fitted into a circular recess like a manhole cover in it's recess. A piston then presses on the hub to stress-relieve all the spokes on one side and untwist all the others on the slack side. The wheel is reversed and the same done again on the other side. Humans would then go in and tweak the wobbles resulting from the spokes which were twisted and are now untwisted. I think it was a Bontrager factory video IIRC.
