The misalignments alone... no, they won't cause the problem except at the low airspeed. Yes he is stalling the left wing (and lucky he hasn't spun it in yet)

Cross-correcting trims 9in this case the offset elevator halves and the one drooped aileron) invite dropping a wing in a stall. The resutls are similar to having rudder offset to the left and the aileron set to correct it to fly yawed, but level. its just not as visible that the plane is cross corrected when it flies by, because its 2 roll axis inputs countering each other, instead yaw corrected with roll. (when the plane flies sideways you can see it every time)