Sometimes they try to disable archivers' access to the page, but it will often be resolved later.
It's a cat and mouse game, ultimately in favor of the archivers but the latest articles may not be captured consistently.
Edit: Yeah they're absolutely going out of their way to block Archivers right now https://archive.ph/scr:8f36a39fe0747078a4da099f395dd4a148e08b68 (401 unauthorized in the response headers being archived)