from what I've read about it: No its not AI - it took years to make using Sketchup + Blender. Kid had an idea, mother had means to make it happen and a connection in the industry to get it into some theaters. It looks terrible, but the memery has led to its success.

From what I've heard, being not AI generated was part of why it became popular, something along the lines of "at least they were willing to make bad looking art themselves instead of having a machine do it for them" or such. This just based on posts about it in my mastodon feed tho as I'm not on any Chinese social medias, so take that with a grain of salt.