I can't agree with that.
For example if your opponent is using Run and Gun or Motion I would suggest a 3-2 or 1-3-1 is allot better than a 2-3.
Let's say we got a team with this ratings and he tries to fool his opponent by playing a Run and Gun.;
Outside Scoring: inept (low)
Inside Scoring proficient (medium)
Then we got another team defending like this in a man to man;
Perimeter Defense proficient (medium)
Inside Defense respectable (high)
Then the defending team will get a better result playing a 2-3 zone (since his PD is an overkill already and he lacks some ID). So in that case a 2-3 zone will be the most effective tactic agains opponents Run and Gun, which will lead possible ratings like this (and we even ignore the extra rebounding advantage now)
Perimeter Defense respectable (high)
Inside Defense proficient (low)
Since the Game Engine will try to adjust during the game as much as possible (i.e taking more inside shots if the outside looks are terrible and visa versa), your team now completely blocks his offense, while when he plays a 3-2 or a 1-3-1, as you suggest, he only blocks the outside (with a huge useless overkill), which leads to more inside shots that give a good look, as said in the rules.
During the course of the game, your coach will make adjustments as a result of how the game is going. If you are making a lot of inside shots, he will tell you to take more inside shots. If the opponent is making a lot of inside shots, he will tell your defenders to double-team in the post more often.
In this case you will certainly keep your opponent to a lower score with a 2-3 than a 1-3-1/3-2.