The raising of the wing has zero effect on the approach or stall speed which is why it still has a high approach speed. The wing produces the same lift at the same AoA, and has the same stall angle regardless of which way the fuselage is pointing. The purpose of raising the wing is not to increase its lift any more than it could already achieve, because it won't, but simply to allow it to be taken to high AoA without scraping the back of the fuz on the ground. The wing raising is there for the sake of the fuz, because they didn't design in enough ground clearance. Much longer undercarriage legs would have solved the ground clearance problem but the designers must have decided that wing raising was the preferable option to much longer legs.
H.