Only reason I doubt that is you would see that staggered as people turned them on. In this case, the first turn on is huge, more than 100TH/s of power. If it was random antminers, it would take a huge swarm of them to get that much power...small chance customers did this all at once.
This is some heavy weight power added that was done all at once, and then gradually expanded day by day in smaller numbers. If there was ever an argument to not be pre-ordering ASIC's machines, this is probably it. I think you will be able to tell which ASIC manufacturers are actually mining themselves, probably with better machines and selling the weaker ones they can sucker into preordering.
Good reasoning. But CEX has been adding and adding like that for sometime right?