> strongly suspect this was intentional

Considering the 404 of that page

> This page is down

> I scream. You scream. We all scream... for us to fix this page. We’ll stop making jokes and get things up and running soon.

vs the 404 of other developer.twitter/error pages

> You've washed ashore on null island

> Sadly, the party is over. Head back to the mainland. Or, if you're up for some exploring, try the search bar above.

I'd say it's quite likely rub-it-in-your-face intentional.