It looks like he was trying to abuse the Black Market deck to ramp up the value of Fairgrounds, although he probably wasn't going about it the right way.
Simulations like to say things like BMU gets 4 Provinces in x turns (where x is usually between 14 and 18), but most decks can't keep up the pace when they begin to choke on green. It doesn't particularly help that your opponent had ample Militias with which to impede you, and you probably got a little unlucky here and there as well.