The difference is they traded the speed for range. It's 1000-fold slower than zigbee (0.1 kb/s) but with a bigger range. They say they can cover whole France or California (including unhabited areas) with only 1000 antennas, thus cheaply creating a global network. With zigbee, you can really do only a local network and still need a local relay to internet.
So, Zigbee allows you to make a fast, fee-less, local sensor network. While this is a global network with yearly fee designed for low-bandwidth sensors.

fyi, 123456 was the wrong code. Problem was entering the wrong code triggered an alert in the system and noone knew where it originated from or what it meant. The contractors in charge of this thus shut the system down for 48h, while they were investigating on it, in fear of a hacker having broke in.

What is amazingly hilarious is the time it took them to understand what happened and who did it, and the disproportionated importance given to a rather innocuous alert.

Hydrogen can be stored in many ways. Oil being one of it actually : from the fuel point of view, oil molecule is a bunch of carbon atoms storing many hydrogen atoms safely and ready to be used. You can either replicate a similar storage, using chemical bonds to trap hydrogen inside a molecule (it takes energy but you can reach very high density), or trap the H2 molecule itself inside nano-structures (with a density of the same order than compressed H2). It can be used for both fuel cell and combustion engine.