O-Guruma was my vote, however, like almost every time you see this type of throw used, it could be argued that it is harai-goshi (In a lot of instances I think ashi-guruma is also a consideration, but the leg is too high here). Personally I think they would both qualify. You'll notice that there is a minor sweep with the hips happening, but it is not very pronounced, partially due, as Q stated, to the fact that uke is a little outside of good harai placement. You will also notice that there is a significant wheeling motion of uke over tori's static leg.
If you look closely, you'll see that tori's driving leg is not bent during the throw despite the fact that uke is shorter. That makes it difficult to load uke on your hip as you would in harai goshi.
It was probably an attempt at harai that turned into something of a O-Guruma. Personally, I don't think it matters all that much, but I'll support Q in saying that O-Guruma certainly does not have to be any higher than it is in that video.