Without reading the article, if it is between "στην­ Πόλι" and "εἰς­ τὴν ­Πόλιν", I can tell you, as a Greek, it is exactly the same phrase. Poli/Polin (Πόλη/Πόλιν) are interchangeable, the same word with a different suffix but with both the same purpose, and "στην" is just "εις την" stiched together.