I think I found the issue:
https://twitter.com/DVanLangenhove/status/1263214732921667585 - loads ✔
https://twitter.com/dvanlangenhove/status/1263214732921667585 - doesn't load ✘ (but ONLY in the logged in browser tab)
Case-sensitivity in URLs... the right URL was achieved by browsing his page, then finding the tweet. Did you share from mobile site or app?
I think this is some problem with Twitter being retarded now. Many other direct links don't work from under my acc. Private Browsing works 9/10 times. Sometimes not even the home page loads.
They did just roll out their new shitty interface
(post is archived)