I think these guys thought they were going to land with less than reserves, so they correctly notified all and sundry.
Upon getting closer and realising that they weren't going to need it (subject to priority for the approach) they cancelled. Once again correct.
Once again, I think not entirely to the inventors intention!
If you
THINK you will, declare pan, if you
KNOW you will, declare emergency.
If you think you will and declare emergency, it's like jumping the queue a bit, at least the way I see it.
As to the committing policy, I second bymonek.