Presumably his finished work is for sale and display so naturally it's a bit less likely to see it up online in an easy viewing format. Check some of it out here though:
To answer the question though, yes wildly and objectively talented. Part of why you would want to watch a video is to see how he works, his competence is on full display more so than in the finished product perhaps.
That is because the way he draws is part of fascination with his art. The speed of it, that he does not need guidelines for perspective, that he just goes from top of head.
If you are curious whether drawing is to your liking, you can just skip to the end of the video. Or, google his name and filter for images - the filter is in top bar.
His process is impressive, no sketches or hesitation; he just "prints" whatever was in his mind. The scenes are incredibly detailed, with complex perspectives
He is a master, as he can produce realistic sketches/art, as well as comical adding his own unique flavors to it. He is really a swiss knife. You might not like a type of drawing but he definitely has it all. And his memory, and stream of consciousness sketching is what is superhuman, and they're super detailed massive sprawls of a sketch.
If there was one thing that I thought all HN users had in common it was the appreciation for a tremendous intellectual gift and better yet, doing no evil with it. I guess you proved me wrong.
https://www.kimjunggi.net/
To answer the question though, yes wildly and objectively talented. Part of why you would want to watch a video is to see how he works, his competence is on full display more so than in the finished product perhaps.