Oh I am sure Whit is safe until July 31 just like Harrison before him. He just won't play as much. They just have to either replace Pache or send down Rojas and fill that spot with someone else
And at the same time, they can probably continue to play over .500 baseball with this lineup and the bench guys never playing, just like they did last year (Harrison and then Castro). But they need Nick to hit because they have no alternative. And Rojas (or Pache!) with no bat in CF still seems preferable to light-hitting and defensively weak LFs whether that is Merrifield or the limited AAA options.
I am sure they they told Pache what to expect, or didn't have to.