You'd be surprised... I went back there today, plant tag in hand, and told them "I think this is a Jerusalem Cherry"... They told me that they "don't think so, why would their grower plant and supply those?" They still had 4 plants of it left. Here's a pic of the tag, and it says, plain & clear, "PEPPER".
Who knows; maybe it's really a pseudo Pseudocapiscum, and really a pepper..