Per PFT: Saints switch Taysom to QB on roster designation.

Nolan said
There's no funny business going on. This team isn't going into games with Taysom as #2 QB after he got zero QB reps in camp.

They're just giving themselves flexibility should an injury occur down the line.

Taysom got QB reps in TC, just not everyday or most practices. I remember reporters tweeting that he was working with the QBs on some days.