He had that 332 SW with his old frame, too. Since the Tec XTC 305 retail SW is 329, I'm guessing he has a light prostock version that is modded to the same specs as retail, as smalahove points out. My point regarding specs is that not all pros play with a 350 SW (Verdasco was well below that at one point), so possibly Nishioka is also one who does not. Since in any case the same specs do not equate to the same racquet, Tecnifibre's wording tends to confirm your point about pros not playing retail frames stock.Pretty amazing they would word it that way.
But that information is objectively false. Check out this recent picture of Chardy with visible lead at 3 and 9 and likely some under the bumper. He is reported to have a 332 swingweight.