One thing that I don't get is, those are not s19 XP but standard model, at 210 of them get 52Ph at 1.45MW, so that's 247Th per unit at 5.8KW, do they squeeze this from a $4k machine?
They are likely the s19 pro hydros, those do about 200th at 27w/TH stock settings, so squeezing an extra 45th at 23w/th seems very reasonable given how much the stock settings suck.
Imagine what the xp hydros custom setting can do.