While on the surface it might look like htmx, it really is quiet different.

Htmx is all about embracing hypermedia and its only goal is to enhance the shameful shortcomings of html. See also the hypermedia.systems book.

E-html seems to be more about how can I do client side rendering without pulling in something huge like react, vue or whatever thing you fancy.

Just my POV as a non web dev that is not affiliated with any of these projects.