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I think you have a good understanding and I assume you’ve read Ted Williams Science of Hitting. It’s all about lining up planes of pitch and bat. Historically with sinkers and low strikes a higher attack angle played and was more in alignment with pitch plane. In today’s game of spin and high zone fastball an uppercut swing gives you minimal chance and results in top spin grounders and swing & miss.
Actually it will. As you noted. MLB pitch plane is like 2-3 degrees. The more your attack angle increased the more you’re hitting a top spin tennis return.
My point was an overly uppercut swing isn't going to result in that low a launch angle. Not unless he is somehow consistently topping the pitches, which seems pretty unlikely.