Battery Acid resulted in water in my transmission??

Cyberpine

My 2018 Ram Promaster City Van (2.4L 9 speed auto) only has 20k miles and has never been near water or off road. However I did do some aftermarket electrical work. I was out of town last month and when I cam back it would not start. When I opened the hood the battery had blown up and damaged some electrical and plastic lines. I took it to the dealership and they wont cover it as it's my fault. Is it possible for battery acid to cause water to get into the transmission? If I've not driven the van since the event, any chance I can fix this without a transmission replacement? See this image:

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