Considering he had never taken a rep in CF ever before a few weeks ago in Boston, but has had a number going back to last season in RF, I think that is true.
The only other possibility you could have done today with the same lineup was Brennan at DH, Florial in CF, Arias in RF. But then people would talk about how uncomfortable they are with Florial and Arias in the OF together, especially one as quirky as Houston's is.
There was no good answer today if you wanted to get Arias in the lineup. And you can't go a week at a time not getting him in a game with multiple ABs.
They kept him on the roster getting regular reps for a reason.