[joveian]

This just means that there are exceptions for twitter.com that haven't been switched to x.com. I use uBlock Origin with all scripts and third party resources blocked by default and got this page when they switched to x.com, but it works once you unblock the same stuff on x.com that was unblocked on twitter.com.

The exception is that some accounts still require login to read. I'm not sure why but I'm guessing that it might be a per account setting that won't be set by accounts that haven't logged in for a long time (I don't have an acount to check). Actually, worble and ploum's comments below would explain what I see, I usually don't try to check the same content twice (or anything all that often) so I wouldn't notice if it sometimes works and sometimes doesn't.