Yeah... he mentions toward the end of the post that he has a larger "pack adze" expressly for carrying in his pack for longer trips.
I agree on the trailhawk being a more useful tool (for me, anyway) but this is meant to be something small and unobtrusive enough to carry around in your pocket. A trailhawk head is neither of those things, at least not for my pockets!
The scenario he describes is you go for a walk away from your tour bus or something and get lost. This could be in your pocket along with a SAK or similar pocket knife and allow you to get a lot of tasks done where carrying a belt knife/hawk/axe isn't feasible. It may be sound a little far fetched, but I've been on two recent vacations where my wife and I ended up going for hikes or walks with what we had what was in our pockets and that was it. In both scenarios something like a belt knife or hawk would have been extremely conspicuous and/or illegal (e.g. traveling overseas where knife laws are depressingly restrictive).
Obviously my preference is to have a good day pack with essentials but that's just not always feasible, so I see the argument for a pocketable tool that can do some big jobs. Not saying I'm going to rush out and buy one of these but I do see some value in the general concept. Food for thought at any rate.