Is this an OK landing now?
Nope.
Although better than the previous video, this is still too flat. A Katana should touch it's mainwheels with the nosewheel much higher than that, and you should be able to hold the nosewheel off until well after the mainwheels have touched.
The Katana stall waning horns are notoriously pessimistic, and can't easily be adjusted.
Typically the stall warning should sound as soon as you raise the nose to land, (flare) continue as the mainwheels touch the ground, and then continue as you roll along, until you lower the nosewheel to the ground.
Review your target threshold speed with your instructor, and check it against the recommended speed in the POH. Make sure that you are not crossing the threshold too fast.
MJ
