Seems HC made them several ways. Teak screwed into plywood screwed into beams with no epoxy coating or anything else does not sound sea-worthy to me. It actually sounds frightening. I understand wooden decks of old, but those were planked and solid - not plywood.
But it is a heavy, full-keeled, "bluewater" boat with all the correct things about it for ocean girdling. What do I know - I have a dangerous near-shore-only boat (that just clocked a 205nm day!).
BTW, that last bit wasn't directed at you - the forum you linked to goes at production boats and catamarans pretty fiercely at times. To them, if you are not wallowing around in a round bottom bathtub barely keeping up with the floating seaweed, you do not have a "bluewater" boat.
Mark