Interesting stuff - I'm definitely doing some sketches at my desk this afternoon to get this all to make sense.
I too had to re-measure to make sure it was a 25" - it is. As other posters mentioned above, there is definitely a ton of fork clearance for fenders and the BB does sit lower than others. Guessing the combination of these characteristics offers a more stable ride under a touring load.
It does sit a bit lower than some of my other 25" bikes - that may change a little when I add some big Panaracer Paselas. Because I like pictures, even bad CL ones, I've added the original shot of the bike from the ad.