Explain xkcd

Date: April 25th, 2011
From: Dan Hoey
Subject: Etymology

Dena wrote:

  Star Wars Wiki explains that Han Solo wasn't using the parsec as
  time unit.  Obviously the Kessel run is a smuggling route from
  point A to point, where the easier route is much longer, and the
  shorter is more dangerous.  Thus he was referring to the
  maneuverability of the ship, rather than his speed.

According to
https://secure.wikimedia.org/wikipedia/en/wiki/Millennium_Falcon#Depiction,
George Lucas has advanced this explanation in the A New Hope DVD
audio commentary.  According to me, this explanation is a factitious
rationalization used to paper over a glaring error in the movie.