Nonsense.
He has no bad matches, only 5-5's and tough 5-5's at that.
And here is why, every character has a solid 5-5 and it is the mirror match, so when determining what a ''bad match'' is, you have to compare the fight to the mirror match, and it will always be a 5-5 because your strengths are taken away or limited and you cannot abuse what you normally can against certain characters, your meter build is equal, your damage and punishment options are equal also.
So take the KL mirror match into consideration when asking what a bad match is, KL cannot do random teleports, he cannot randomly dive kick, he is fighting against a low hit box and at some point he will have to spin to beat the opponent out of fp pressure or guessing the bp is coming.
Now, there is no character in the game, that can make a match worse for him than his mirror, infact in some of his other 5-5 matches, he can still afford to teleport like fuck and get spicy with fp pressure, and even abuse something as silly as low hats against 12 frame mid characters that are supposed to be ''bad matches'' like Mileena for example, there is no one in the game that makes something unwinnable for him or takes anything away from him more than his mirror, so I honestly can't understand where people are getting his worse matches from.