https://wccftech.com/the-callisto-protocol-isnt-set-in-pubg-anymore-devs-want-players-to-be-scared-of-single-enemies/

The Callisto Protocol, a Dead Space spiritual successor in development at Striking Distance Studios, isn't set in the PUBG universe anymore. The news came right from Glen Schofield himself.

The Callisto Protocol is its own story and world. It no longer takes place in the PUBG universe. It was originally part of the PUBG timeline but grew into its own world. PUBG is awesome and we will still have little surprises for fans, but this is its own world, story, and universe.