Colibri,
My understanding is that different cultures passed through the stone age at different times. Neolithic (late stone age) tools have certain characteristics -- for example, a sophisticated ability to create sharp blades from stone. I'm not sure that your scoffing is warranted. If the culture on Sint Maarten didn't use bronze or iron tools at the time when the artifacts under discussion were made, then describing the culture as a stone age (or Neolithic) culture is probably appropriate.