What exactly does the selling point "10 times higher geometric detail" of Id Tech 7 mean?

Id Tech 7’s main selling point has been that it has "10 times the geometric detail" of the predecessor.

Does this actually mean something, or is it marketing garbage?

I don’t know about 3d engines, but arbitrarily increasing the number of polygons is something any engine can do; if they refer to speed instead, I’m very skeptical that it can render 10 times as much polygons in the same amount of time.