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https://www.yachtsurvey.com/moisture_meters.htm

There are a lot of unknowns and variables in the science of moisture detection, etc. From my experience with my 2013 130 Super Sport, I was told by the BW factory representative that moisture is a byproduct of the foaming injection process. I discovered water in my transom while drilling holes and installing a kicker motor mount. I also heard that fact from experienced dealers familiar with the issue. I guess when the boat is listing to one side, is several hundred pounds overweight, or the transom falls off it will be nice to know that you can’t sink a Whaler.
As far as your transom goes I would closely inspect every screw and bolt in the transom for proper sealant. If possible, remove some hardware to inspect for water leakage or sealant throughout the hole. Repair with only marine grade new sealant.