You actually have to take off the keyboard for take off and landing.There is inconsistency among the VA cabin crew, which is probably inevitable given there are so many of them. I always bring my iPad on board, which has a keyboard case. Maybe 1 in every 5 flights I'm asked to fold the keyboard away for takeoff and landing.
"iPads or devices with keyboards must be switched off and stowed away for take off and landing"
Anything larger than the safety instruction card has to be stowed.