> What is the motivation for someone to put out junk like this?

Getting something with a link to their GitHub onto the frontpage of HN. Because form matters much more in this world than substance.

Clout and reaching the top of HN apparently.

The animated explanation at the top is also way too fast at 1x, almost impossible to follow; that immediately hinted at the author not fully reading/experiencing the result before publishing this.

Why is it that some people feel entitled to take this kind of tone as soon as AI is used?

It's inappropriate to label a free side project 'junk' or 'slop' even if it contains major errors.

Particularly when there's a disclaimer about possible inaccuracies on the page.