Pagers are civilian objects, they’re categorically different from radio equipment because they can be used by civilians.
Furthermore, these exploded in civilian structures among the civilian population. Pagers blew up inside people’s cars while driving down the highway. They blew up on grocery stores. They blew up children.
It’s terrorism.
There’d be billowing clouds of steam coming from data centers if that were the case.
Pretty sure the water just goes through coolant piping and comes out the other side warmer, because water is a good heat sink.