We might have just gotten our hands on the biggest piece of evidence that proves that The Last of Us Remake and The Last of Us 2 multiplayer exist.
The LinkedIn profile of a Naughty Dog employee currently lists two interesting projects at the first-party PlayStation studio: an unannounced remake and an unannounced multiplayer project. To be more specific, quality assurance tester, Corey Hong, lists among his current Naughty Dog duties as "QA testing and development support + Level Point of Contact for unannounced remake project" and "QA testing and development support on environment design for unannounced multiplayer project."
If that's not proof enough, then we don't know what is.
Around this time last year, Bloomberg reported that Naughty Dog was working on a PS5 remake of 2013's The Last of Us. The same report states that Bend Studio, the makers of Days Gone, was originally set to help out with a still-unconfirmed multiplayer game. Since then, multiple intel and leaks from various sources have emerged hinting that both of these projects exist in some capacity.