From what I can see, it has not been clarified in errata, but probably should be.
I'm pretty sure the intent was to account for the +2 Magnitudes for Voice. Because who would cast a Touch range version of DEO? I actually knew a character who did this,and allowed it to strip +10 might at 5th level, because touching a demon is a pretty bad idea. He put it in his talisman, and then botched the attack roll, leaving the demon in possession of his talisman.
Good times. 
Well, we're here to help, aren't we?
And yeah, a DEO lvl 05 at touch range strips 10 might, 05 more than a voice range DEO.
If you deconstruct it, it's actually Base 4 (strips base +2 magnitudes = 10), +1 touch = lvl 05.
It doesn't strip 14 might, just like a lvl 05 "normal" DEO will strip 05 might, not 13.