No one is going to come out and publicly state that Eloy is getting demoted while he is still rehabbing. No one in the Sox organization is that dumb, well at least in upper management.
But it should be really obvious that the fact that Andrew Vaughn can pay a passable LF means the Sox have options they didn't think they had 3 months ago, and those will have an effect going forward. Now whether that means Eloy goes to DH, or the Sox go with Eloy/Robert/Vaughn from left to right remains to be seen. It also could mean that Vaughn gets left, a new RF gets brought in, and again Eloy demotes to DH. But it should be really obvious that it is NOT a slam dunk that Eloy is the starting LF on Opening Day 2022.