Ostap1983:
I doubt it's a replacement
Turkiye also has an old
Genoese fortifications TWHS, which is almost the same as the new one, with the exception of one element (Kadikalesi / Anaia), so this is almost certainly a replacement. But you're right that this was originally supposed to be a transnational nomination. Ukraine, Italy, and Greece worked on its development in 2011 (
source), with the possible inclusion of France, Turkiye, Israel, Tunisia, and other countries (
source). Turkiye did join eventually, but the development of the transnational nomination halted (possibly after Russian occupation of Crimea). Since then, Turkiye has seemingly been trying to nominate its components independently.