I of course quickly just googled it myself and found the page, and so afterward I went to the source of the blog post and searched for the URL to confirm that it wasn't actually linked to anywhere. Turns out that about three quarters of the way down, in the "Key Bindings" section, there is a link to the Helix keymappings documentation page, which appears to be the closest thing to a direct homepage link.
Anyways, no nefarious intent being implied of course, I just found it sort of interesting. I am pretty certain it just got accidentally left out, or maybe the project didn't have a homepage back in December of 2024 when this was originally written? Although the github page isn't directly linked either (only one specific issue in the github tracker).
Oh, and here's a link to their page: https://helix-editor.com/
And github page: https://github.com/helix-editor/