That may be striped for two lanes, but it's barely wider than many regular TWLTL's, like
this one on NY 104 (ironically part of a road diet a few years ago).
My PA example above is also quite instructive on this point: pan around and you'll notice the TWLTL is striped for one lane on one side of the intersection and two on the other with
no difference in road width. That one is also "doubled" for about twice as long as the NH example, although at least it has standard white stripes adjacent to the lanes instead of yellow.