How is it useful? I'm no expert in combustion engines, so I'd hesitate to rely on a slop graphic like this to learn about them as I doubt the creator has any idea about them either.

It's like a friend - he was like "Look at this awesome set of categorized interactive animations from claude to learn geometry!".

And like 60% of the animations were technically just wrong. Very pretty though, and the effects were cute... I guess...?