in this or Jurassic World, did they

Not that I ever heard but a couple of series fans people told me it was explained away elsewhere that Site B 'died out' between the 2001 and 2015 movies.

Found this though: https://movieweb.com/jurassic-world-site-b-explained-isla-sorna/

The dinosaurs were all moved to the park? So maybe it'll be brought back for the next one?