There's a difference between "possible" and "advisable"
There is, but I didn't use either of those words. I said viable, which is the perfect mix of possible and advisable. Writing a game in JavaScript can be really easy if you use a JS game engine. Much easier than most of the other languages he listed.
I wasn't saying it was impossible in general, though. specifically for ducky duck
but I have a hard time believing he could make anything right now, in any language
I don't see why you quoted JS then, that just seems weird. If you'd quoted C++ it'd make sense, because C++ is a difficult language to grasp as a beginner without much computer theory behind you.