Tiny Electric Motor Is as Powerful as Four Tesla Motors Combined (insideevs.com)

No cost or prices listed for those looking. Looks like you need connections or a big project to get access.

Same story from the manufacturer: https://news.ycombinator.com/item?id=45675020

Does it need liquid cooling in order to sustain operation at that power density?

I see ports on its edges that look like fluid connectors.