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Thats kind of extreme IMO. You have to consider that a group of AAA stars would typically be a replacement level team at the MLB level. A group of NPB stars would lead the AL in Ws and a group of NL stars would break the MLB record for Ws in the AL.
The NL is significantly better than AAA and clearly better than NPB. NPB is also clearly far superior to AAA. Heck, I think the gap between the AL and AAA should be larger as well.
AL is the strongest league by a healthy margin, but I see NL as still WAY closer to AL than AAA and NPB is closer NL than AAA as well. The minor leagues are still a lot worse the Major Leagues.