I pasted the URL into firefox, and didn't see that huge "you're using an adblocker popup".

I opened a firefox private window and navigated to it from the HN page, and got the adblocker popup.

Right now I have two tabs open in the same non-private window, one showing the adblocker popup and one not. In the one that's not I can view the whole page. Reloading in the one that is not showing the adblocker popup then showed it.

I navigated from HN in a non-private window and got the popup. So this seems to be referer constrained in some sense, not necessarily browser based. Hard to confirm.

I do everything in private by default, so I clicked on the link from a private HN tab and did not get the popup on firefox mobile.