The problem with this kind of thing is that zoom bombing is "easy", in terms of you can do it from the comfort of your home.
One way to judge the seriousness might be to ask what might the ramifications be if the "interruption" was done in person at the traditional venue.
In this case, if someone did indeed do this deed in a court, they would almost certainly have been dragged down to one of the cells to consider their actions for a few days.
Would it be reasonable to do the same if someone zoombombed an actual court proceeding? Most people would be awed into good behaviour were they to be at the building itself, whereas we can see that idle teenagers can get away with this kind of behaviour because their apprehension is less likely.