No, you have it backwards. The flap opens toward the deep end to allow oil to drain back into the sump but during deceleration or braking, the oil will force the flap shut, preventing the oil from moving to the front of the pan, away from the oil pickup.
A little more info, if it is something you want to do:
I trimmed the bottom of the stock baffle thinking that would help the oil returning from the front of the pan to open the flap because the oil would act on more of the hinged surface area. However, I don't think trimming is necessary because for one, the hinge hangs open slightly because of the angle at which the engine sits in the chassis and second, during my water level tests, there's really not that much oil ahead of the baffle with the engine shut off and when it is running, probably at least a quart is always draining back from the top of the engine or in the passages of the engine so the oil draining back from the front of the pan may not even be at a level high enough for that to be necessary.
Lawrenceville, GA