Correct. The frame must be installed as part of the shell construction. Normally, a construction door follows, which the construction company/window installer provides. If you have your own front door, you naturally also need your own construction door. Otherwise, the correct door must already be installed, and no one will take responsibility for any damage unless you stand there all day watching who makes the dent (video is not allowed).
I would ask your door installer if you can borrow a construction door for the construction phase. The front door usually comes at the very end, even after behind the stairs, etc...