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I don't - it displays immediately for me when I load in a Firefox instance without a logged in Google account.

Google tries to make you log in if it knows you have an account. You can erase Google cookies to avoid that.

It's not about being signed into Google, it's about running JS.

Is it? JS in enabled, but I'm still required to login (both with or without uBlock running). Works in a Private Browsing Mode though.

It's not the problem you're seeing, but the page does require JS:

To use Google Groups Discussions, please enable JavaScript in your browser settings, and then refresh this page.

NoScript users will be automatically redirected to this version (which doesn't require it):