Boyang's Lz, 3As and Flips were all textbook, he had a lot of flow out of his 3Lz-3T combo, I remember it was better than Han's. The Euro guys were remarking his jump technique is impeccable. So the total GOE is puzzling, as I remember he had transitions going in and out too, for a few jumps.
not his 4lz... that wasn't great today. the 3A combo wasn't IMHO the best I have seen... the 3lz-3t was DIVINE. I agree.
of course, the overall GOE is impacted by the minus 4 for the fall. It is also impacted by the fact that there are perhaps some other quads that didn't receive much +++ like the Salchow and the 4t-2t.
So if on half of the jump passes you get negative (fall) and neutral GOE and those are your big jumps, then of course the GOE points will be lower.