My interpretation would be that it's about the same level of polish ux/ui-wise as macOS. As with OP, unfortunately I don't see it either - the screenshots show some resemblance with macOS but without any of the finesse.
It's not completed yet. The features are listed under the section "project goals" and the download button has a note calling it a developer preview image.
In my experience with some Linux distros goals alone don't necessarily work out, but the approach with trying to be compatible with actual Mac OS apps is already more notable than an Ubuntu reskin.
In my experience with some Linux distros goals alone don't necessarily work out, but the approach with trying to be compatible with actual Mac OS apps is already more notable than an Ubuntu reskin.