This is not something I know a lot about, but I have some questions..

I know older constructions buildt with chopper guns or chopped strand mat and polyester have osmosis problems, but I tought the risk of osmosis (and hence blisters) was negligible with woven mats and epoxy. As far as I understand osmosis on boats, the ends of the glassfibers need to be exposed for the water to enter, and chopped fibers are especially bad in that regard (not to mention the inconsistency of the fiber layout).

Delamination due to humidity in the laminate? How does this really work? When the matrix is bonded to the distance material, how is the bond destroyed by humidity? Decomposition of the distance material?
If mooring the boat is enough to let a critical amount of humidity trough to the core by diffusion (or is there something else at play), what about letting a small amount of water stay in the hulls while on land/storage? Or even worse, letting water/humidity stay in the hulls, closing all ventilation and letting the sun heat the hulls?