Yes I know, I've worked in a datacenter. The fire suppression systems are not meant to fail. Whether that is a Halon or newer CAS (clean agent system). Most of these places don't pay 40k for even the most basic system to have them fail. Someone definitely dropped the ball here. My guess, and this is just a guess is that they were using the bare minimum system, no Halon, no Evac setup. Maybe this incident will force them to upgrade to a better one. Especially when your datacenter hosts millions of sites. At minimum they should have had an FM200 suppression system with a backup evac system to clear the room of all oxygen, without oxygen fires cannot breath and the FM200 system is non conductive to electricity which means that it wouldn't have destroyed the servers.
The datacenter I worked in was owned by the US Military, so, it did have top of the line million dollar suppression systems.