All CJF said was he expected Allar to play. Didn’t say he will play for sure, or how much he would play. He also indicated that Beau was ready to go.
Allar’s status may be day to day, and the statement might have been targeted at MSU to think they might have to prepare for both QB’s. If I were HC, I would have said something like that Allar probably will play just to give the upcoming opponent something to think about.
But if Allar is still injured he may start as CJF did with Clifford a couple of years ago, which IMO didn’t help the team.