This is just some way for a flight department to get someone to work for free. I am guessing that the captain is single-pilot rated, but the company or passengers want a second pilot on board, so the chief pilot has come up with a convincing ad to solicit an inexperienced pilot to work for free. Dangling the carrot of jet time so to speak.
Young pilots: You dont have to work for free!! You can't command alot of money, but you should at least command a little for your time!