no. that would require a bilge pump if each wave drained to the inside of the kayak, under the deck/floor
a SitOnTop is one hollow molded boat, water inside the cockpit draining through scuppers,
It isn't water inside the kayak (between deck and hull) that you drain with the drain plug after getting out of the water...
it self-drains water inside the cockpit while you are out on the water
Scuppers drain the cockpit area, where you sit.
Pictures explain it better.
Note "Self draining scupper holes top/deck
view inside kayak, between upper deck (floor) and lower hull, water drains off upper deck, where you sit,
and goes down the pipes/tube/column and
drains out below the hull/bottom back into the lake/ocean.
view below kayak hull, holes where the water exits
some people put tape over the front part of scuppers on hull/bottom
to suck/siphon water out faster when they move (venturi effect)