No. They came back because the Nords started a civil war. Please do your research.
He was asked why they decided to make an elder scrolls game in skyrim, which he responded that they really wanted to make it in skyrim becuase that is where the human race started in the elder scrolls history, and they this man worshiped dragons, which they summoned. Therefore i concluded that the dragons are back from extinction becuase there is a faction in skyrim that managed to bring the dragons back by summoning them somehow, what do you think?
We already knew from past games that Man was born in Skyrim, Nords worshipped Dragons, and that ancient Nedes could speak to/summon them.