Without significant data from the rest of BB, i would not believe the comment outright that it reduces shots. It likely reduces an opponent's will to go inside, it might drop shots by 1 or 2 if they can't generate open shots in a slower paced offense, but dropping 6 sounds like abandoned strategy.
I'd settle for 15/12 built players mostly out of market demand right now. I don't fancy spending 5 seasons building a player specifically how i want them on the inside skillset. Since i found a 15 ID 10 SB player on the market for cheap already, i can just add the 2 SB before the end of his build and have that at a low cost. Ideally i don't know if i care all that much. If i have 27 points in those skills combined, whether i have 20 and 7 or 7 and 20 or somewhere in between, i probably have a inside defender that can do the job.