yup.

Han was bullshitting them. Remember, Han is a fast talking scoundrel who runs scams on rubes.

For people who don't know Parsec... is a unit of distance. an object 1 parsec from the sun would be an object that has a parralax angle of 1 arc second. a second of arc is the easiest to explain- it's 1/60^th of a minute of arc, which is 1/60^th of a degree. (arc second is 1/3600^th of a degree.) it comes to about 3 lightyears.

It would be like saying, "I made the Chicago-NY run in less than [whatever miles]!" when talking about how fast his ship is. The distance is fixed. the kessel run is largely fixed.