Disruption is not demonstration by any stretch of hallucination. It will be violent. Babu has been quick to declare their protests/demonstrations peaceful.
True, disruption is not demonstration; it is possible to demonstrate without disrupting, and it is possible to disrupt without demonstrating. But why should demonstrations not include disruption? I'll even suggest that the most effective demonstrations will usually involve the disruption of
something.
One can also look at generally accepted understandings of "demonstrations" in a context such as the present one. For, example, here's one:
https://en.wikipedia.org/wiki/Demonstration_(protest) All sorts of interesting activities there.