First, if you are a non top 6 player and you beat a top 6 player that's always going to be at least a little impressive. Second, I don't know if you watched any of those two sets but it was pretty clear that it wasn't just hand pain.
And if Chu Dat is such a legendary Ice Climbers player then surely he would have done great at SmashCon. Since he made top eight at Evo, the largest smash tournament ever, he must have an easy path to at least top 4 or 5 at SmashCon. Oh, it looks like he got 17th at the same tournament where Nintendude got 9th.
But that's just one tournament, so let's look at some other stuff his year. Maybe he only does well at super majors which is okay since they matter the most, so let's look at Apex. Seems like he got 25th and Nintendude got 9th. Hm... Well he must've played well at CEO since he is unquestionably the best IC's main, so what did he get? 25th... Hm...
But hey, he has to be the best IC's because he got 7th at Evo right? You're right, that's all that matters and everything else is completely irrelevant.