I don't think you're rationalizing. Creativity requires fuller understanding of every little detail and interdependency of the thing you're creating. It might be easier to deceive someone else, but not yourself, you just know too much.
Ohh, you're right.. maybe I don't actually disagree with the "article" (it's not really much, and I didn't read or listen to the whole thing yet) then.. because yes, exploring truth certainly makes it easier to lie as well. Being able to be honest to yourself doesn't really translate into being so all the time, and much less into being honest to others necessarily (though I like to think it can help, too ^^).
If you dove around in certain swamp a lot, you can also much more easily walk among some patches of grass on the surface, pretending there is no swamp to an onlooker; precisely because you spent some time in it.
But I still would like to think real mastery of anything worth mastering comes out at a point where you prefer even mediocre truths to grand lies, so I don't want to completely retract my first knee-jerk comment either :)