I know everyone is going to put horrifying, but given it is fan-made, it isn’t that bad. If this isn’t some autist trying to recapture his childhood, then this is very likely a small studio trying to spotlight themselves into the industry through a recognizable brand. A tech demo so to speak, giving the animators a pre-existing template.
This isn’t uncommon in the industry. For a recent example, puppeteer company Swaybox struck a deal with Warner Bros to produce a Robin movie after doing a demo using the Iron Giant:
https://youtube.com/watch?v=mRjkqYvhwig
Yes, these are puppets, makes this one hell of a showcase…