They would have to be referring to the entire bicycle, i.e. the MkII vs MkIV, since in terms of hubs alone the BWR would have to weigh 880g for the two to be on a par, and I don't believe that's possible. I'd also wager that the BWR is heavier than the SRAM T3.
I aim to get the proper stat, but so far it's not been forthcoming.