I spent far too much time poking into the site’s code, found the redirect.
Spoiler below if you want to find it for yourself.
What ended up working was to use chrome’s dev tools → network log → “preserve log” tickbox, let it redirect, then poke through the log until I found the css file itself that was being loaded. It can be read through at https://istheshipstillstuck.com/_next/static/chunks/pages/index-02c185e4fedcbc888c00.js if you’re interested.
