I think the difference is whether the vibration is expected.
Vibrations from being launched are probably accounted for and tested numerous times, while an unintended vibration caused by a "sudden, unplanned release of a clamp band" could cause unforeseen damages to the instrument.
The statement does not actually say anything about the magnitude of the vibrations during this incident, let alone how they compare to those expected during launch.
"Some vibration" doesn't give the same feeling in the reader as the techs and engineers on the floor felt when they heard a 10 Bn USD science project that millions of people are hoping to learn from crashes into the ground.
