Dictators love to use symbolism that links the regime to the country’s ancient roots and then make those symbols stand out. It’s part of the nationalistic drive. If it doesn’t exist or doesn’t fit somehow, it’s invented or adjusted.

Mussolini would draw on the greatness of Rome even in architecture and mix it with modern to look towards the future. The lasting empire. Hitler had no such powerful local symbolism so also drew a lot from Rome for his “1000 year Reich”. And what wasn’t really Roman was just called Roman to make it easy.

That's a valid take, I agree with you!