Not to be disagreeable, but I have a Yeti SB 5.5 with a nearly identical build. Similar wheels (DT 1200/30), Similar burly tires, lighter pedals, and everything else is within a few grams. Those wheels are 1550 grams - crazy light by any standard. Mine weighs 26.9 lbs with pedals on 2 different scales. I rather doubt the SB130 is a 9.1 lb. frame, thus the question... Maybe his mini-tool weighs 2.5 lbs? Nicely spec'd bike though, eh?
Very nice trail build, I'm looking at similar, perhaps even a bit lighter for the mountains of Idaho. How does it ride with the 150mm? Feel like you get a bit more bite on the front wheel in the tight corners/easier to stay over the front? Again, nice work...