As someone who IS a longarmer....
The starch is not a problem - if anything, it actually HELPS to stabilize the quilt and keep it flatter.
As for the wrinkles, Feline Fanatic gave a great answer there too. Doing a hand-guided panto does indeed make it harder to see potential problems like that. Custom work or FMQ are usually done from the front, and make it easier to work out small problems.
And on robotics (which I do not have), it could go either way - because some longarmers "set it and forget it" with their robotics - the walk away until the pass is done. Others will stay close by and monitor the system.
You should contact your LA'er and see how she wants you to handle this. If it were me, I'd just have you bring it in "as is" and spritz the worst parts myself while the quilt is on the frame. The water will loosen the starch and the tension while on the frame will remove the wrinkles.