HN discussion: https://news.ycombinator.com/item?id=41404064
Similar tools:
https://github.com/dividuum/html-vault
https://github.com/MaxLaumeister/PageCrypt
https://github.com/a-nau/password-protected-website-template
https://github.com/sowbug/quaid
https://github.com/mprimi/portable-secret
Thanks to @refalo@programming.dev
I think they mean taking a static site, and encrypting that with an attached JS. It could be done with a browser extension too (probably), but that way it would be less portable