I call that a bold statement. It's not like you have to face 100 Koreans, you only face 6. And even if they might be quite predominant in this game mode, it does not mean they ultimatively will win. (see OWC and MWC4K)
Playing in a tournament is by far different than playing single player. Also jhlee can hardly defeat entire teams alone.
Korea literally put none of their 4k players in this year because almost all of the good 4k Korea players stopped playing this game lmao. It was just a bunch of mid/high-tier 7k players winging the 4k cup. As for the OWC, I don't even think that many people thought Korea had a chance of winning tbh. Their roster didn't look very daunting once released.
Honestly, it just depends who plays this year and who decides not to. A few countries have a chance this year but I guess we'll see it when it unfolds.