Is this extension making the presumption that if a hotel is an Express Deal, it is also a regularly priced hotel on the non-opaque Priceline side?

This is not exactly fair, as I'm looking at this from my software testing experience, but I found an interesting occurrence. I did a search on Seville, Spain for Dec. 30-January 3. This displays a 3* and 2* in Seville Town Centre, neither with listed amenities. Although there must be some Priceline-regular-side hotels that fit these criteria, the extension tells me there are no matching hotels.