Of course Nostradamus put no date this quatrain much less 2023. Further, all of his prophecies are vague word salads that people project onto after the fact.
In quatrain 5.78, Nostradamus wrote:
“In the year 2023, the great king of terror will come from the sky. He will bring with him a great famine and plague, causing the death of many. His reign will be short, but the destruction he causes will be long-lasting.”
In quatrain 8.23, Nostradamus wrote:
“In 2023, a great leader will rise up in the East, uniting the nations under his banner. His rule will be just and fair, and he will be loved by all. He will bring peace to the world, and his reign will be long and prosperous.”