Constantinopolis Taberna Building
According to this BGG post you were correct in your initial interpretation and the "one" is a misprint:


  unfortunately it was a misprint on the Taberna tile. [...] The correct symbol is the one printed on the board, [...] you are not restricted, you can use [the Taberna] as many times as you wish.


So yes, the rules are correct. You can buy any goods that you would not otherwise be able to buy (because you can produce them), but within the limitations of the current market.