The fact that they attacked them via their communication network that was intended to avoid Israeli surveillance, is irregular warfare at its finest.

The main injury inflicted on individuals was psychological - we got into your supply chain this far. Also, your attempts to avoid us failed.

But at an org level? They just disabled the entire comms system, whether through explosions, or by making people scared of explosions.

What's the contingency plan for this in Hezbollah? And will it have credence, given their last grand idea of "let's use pagers to avoid the Israelis" ended with a large number of simultaneous explosions?

It's a very clever attack from a psychological POV.