Sean,
As Tom Mac mentioned, Bethpage Black's bunkering is sever. What it isn't, is what this person said.
"...they don't interfere with ground movement and thus deflection as do the bunkers at Bethpage Black for instance..."
Holes 2, 5, 6, 10, 15 & 18, by the simple nature of the land on which they sit, have no possibility whatsoever of employing a ground game. Holes 3, 8, & 14, all par-threes, also have this same situation. 9 out 18 with no possibility of a ground game, not because of poor design; rather the exact opposite as each of these holes work well.
What about the others? Holes 1, 7, 11, 12, 13 & 16 all have a good portion of their front green entrances open to allow for play on the ground and onto the putting surfaces.
That leaves three holes, 4, 9 & 17. 17 is a par-three that is completely surrounded by bunkers.That is a quite common occurance in holes of this type and, in fact, GOLF Magazine named it as one of the 500 greatest holes in the world in 2000. It can't be that bad! $ actually has a limited availability for ground play when the player places his second shot to the far right of the green as Tilly designed it to be played.The bunkers fronting the green are the "Risk" vs. the "Reward" of finding the putting surface in two.
That leaves the 9th. Surrounded by bunkers, this green has no ground game open to it whatsoveer.
One hole out of 18... I think whoever wrote that doesn't know Bethpage Black and DEFINITELY doesn't know Tilly whose first and primary aspect in all of his designs were the green entrances for the purpose of the ground game. He actually wrote that on a number of occasions...