Really weird criticism. If you're confused about how GitHub works, you might follow the link to their website[0] (when you click on "Release" in the readme) and then scroll down to find a "Download for Windows" button.
At least on desktop, there's also a link to the main site in the About section of the repo. This might actually be a better link for the HN submission, as I bet there's a non-zero intersection of hex editor users and people who completely do not understand Git whatsoever (assuming they've even heard of it).
0. https://imhex.werwolv.net/