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I wouldn't call it off, but yes it is shorter. From memory it is 376mm which is less than the standard for the pomp/pompet (390 or 395 depending on where you look) but similar to a normal road fork. I've been using a few forks of that length for a while and lots of other people have too. I measured the head angle on a medium with it and got 72 degrees which is in the range for a normal road bike, so handling is totally fine. Have a trundle back through the thread and you'll find lots of examples.
Wouldn't the axle to crown distance be off if it was the 26"?