Not sure if there is a question here, or just stating a fact.
One option, if you are looking for a way to add some non-skid to the deck, is to use KiwiGrip. It goes on like thick texture paint, and once dry, covers the deck and provides a “non-skid” surface.
Or, if you don’t need nonskid, you could just paint it (with a good 2-component marine paint made for this sort of application.
Or you could apply new gel coat.
In all cases, a fair amount of prep work is involved to get good, long-lasting results.
Greg