I have no clue. But I don't think reformed epistemologists can be equated with presuppositionalists. Presupps. have to think they're right to begin with and will openly admit they cannot be wrong. I doubt Plantinga would go that far. William Lane Craig has (by arguing from religious experience equally automatic, indisputable proof), but I would expect Plantinga to be a cut above that.
Maybe I'm just wrong.
Maybe I'm just wrong.