I will question why so high a speed on approach with my school, this is what I have been taught from the start for the Warrior, along with climb at 80, cruise at 100, decend base at 80.
Climb is 1kt above Vy (best rate of climb) for the PA-28-161, which is what I've been taught. However, I trim for 70kts on base and keep that until I cross the threshold, at which point I ease back to 65kts for the flare. Works well for me. If I get it wrong and arrive at 70kts it floats like mad - 5 more on top of that cannot help at all. Maybe they think you can get away with it when you've got 1700m of runway to play with
When I was first briefed about landing the beast I was told that a stabilized 65kts on final was 'ideal' but they factor in a 5kt safety factor to account for the inability of students to get speed right (and I'm as guilty as any there) - better to come over the hedge a bit fast than stall it on short final.