Yep, flawed study. The stuff in Brighton, deep Dorchester, Hyde Park and Roxbury should be thrown out since a lot of it is very much not TOD and you'd barely know you were living in Boston.
That is pretty ludicrous - Dorchester makes up nearly 1/4 of the city's entire population and is by far the largest neighborhood land area wise. Plus it has the red line, high speed line, and commuter rail/fairmont line. Same goes for the rest of the neighborhoods like Rozzie, Westie, Hyde Park - the two families are three deckers are as 'Boston' as any Brownstone in the Backbay or South End.