I think 2015 and 2018 were when he was at his offensive best. 2019 onwards he realised he could win without attacking and he can’t summon that ability now
Yes a bit slower but judgement error by a lot and giving so many free points. He is relying a bit too much on the drift. Sometimes your opponent can control the drift as well especially if your smash isn't that threatening
And completely unsupportable player this LZJ guy, needless to say. But KM put him in that position that he can gloat off his luck again, so he can't complain.
I think LZJ gets it now, that KM plays like MD, always keeping the shuttle down, drop shots, nets, pushes and flat drives, and lifting only when safe to do so or forced to.