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> The "Elsevier block" is just a PR stunt, there is a button on the bottom of the page that directs to the (unblocked) Elsevier website.

Better would have been to provide instructions on how to evade the Elsevier block using general purpose anti-censorship tools.

On that same "blocked" page there's also this:

Would you like some tips about avoiding DNS blocking? Take a look at our practical guide about VPN and DNS blocking here!

Google DNS and its IP addresses are mentioned, so they are probably enforcing just DNS blocking.