The way he lost was really strange, I think they need to rethink their coach...
KM just walked slowly around, lift, and die to the smash. He did not change his strategy at all, just kept lifting and losing. The opposition is WR 47, and reasonably old (so not some young gun), with a limited level. KM does not need his A-game to work to beat him. B-game will do just fine.
KM's normal playstyle (A-game) is "active defense", with the key point of Active. So lift, wait for them to smash, but make sure you comfortably receive the smash and then make them pay. So defending, but as the hunter instead of the hunted.
B-game is to attack like most of the other players. Attacking has higher margin for error (use that nervous energy on something productive), and getting tired makes you less nervous. (Which is why we see styles like PV Sindhu doing well in big events vs TTY artistic style, cos when nervous, attacking is easier.)
KM's attacking game is actually pretty decent, he talked about changing his style and attacked for a while in 2019 with success, took down Ginting etc. And then he stopped attacking/COVID hit, but regardless very impressive that he was preparing a Plan B.
In singles people will lift/clear to you, its not like MD/XD where sometimes there is simply no chance to attack. At the worst just net and guard the net more, in that game he netted and stood back, so was unable to punish the re-nets. Normally he does that and just lifts (cos good defence), but its a tactical choice you can easily adjust, just stand closer after netting. Even if losing points after attacking at least it will help lift his lethargic rhythm and clear some nerves.
Why did he go to all that trouble of preparing an implementable Plan B for a year, then walk around like a stunned mullet and lose tamely? I understand KM might be in shock and panic, but WHAT WAS THAT COACH DOING?!