The Piracy Entities were not printed with the other Piracy cards. Likely they were printed on a sheet which contained a number of Promotional cards of the era. Noteably, all of the cards from Promotional Set 3 that I've seen use the same UV reactive ink that the Piracy set did. These cards look pretty interesting under a UV/black light.
Note that the depicted Print Sheets are just example layouts. I don't know what the actual card layout of these sheets were. In fact, the actual layout was likely more randomized to make it easier to pack boosters.