Altitude loss for 5h Duration Flight

Kathrin, she got her licence last year, made a flight of total 5h 14min.

Take off and landing was on Saanen (Switzerland) at 1029m.
Release Altitude was at 13:16 on 2112m, which is a normal release altitude for
Saanen.
Last point logged above release altitude - 1000m was at 18:23 on 1117m.
This gives a duration of 5:07h.

I thought this is ok for the silver badge duration flight and signed the claim
form.

You may imagine how frustrated she was as the NAC refused to accept the flight
for the reason according:
SC3 4.4.2 Loss of height and application of the height penalty
c. For speed and duration flights, a loss of height exceeding 1000 meters will
invalidate the soaring performance.

My question, is this decision really in terms of the sporting code?

Ok, the definitions a
DURATION 1.2.6 The time elapsed between the START TIME and the FINISH TIME.
FINISH TIME 1.2.4 The time that the SOARING PERFORMANCE finishes.
SOARING PERFORMANCE 1.1.1 The performance during that portion of a glider
flight from the START POINT to the FINISH POINT.
FINISH POINT 1.1.12 The WAY POINT marking the end of a SOARING PERFORMANCE. It
is:
a. The point at which the nose of the glider comes to rest without external
assistance after landing, or
b. A WAY POINT declared as the FINISH POINT or goal, or
c. The midpoint of a FINISH LINE, or
d. The point at which an MoP is started.

So the decision of the NAC was ok, because the altitude loss between release
and landing was 1083m, 83m to much.
However, if she would have started an MoP just bevor crossing the 1000m limit
the flight must have been accepted.

Is this not stupid?

Peter Nyffeler
(OO soaring club zurich)