In the National Museum of Iran, in Tehran, there is a display with a timeline of the history of humanity.
There's a break, for the flood: all of history stops, from Mesopotamia to China, and then somehow restarts again a couple of years later.

No explanation is given as to how the Chinese, for example, continued building their civilisation with no actual Chinese people still in existence. Ditto Egypt and Sumeria.
So, yes, it is entirely possible heydarian has swallowed this nonsense, if that's what they're teaching as real history.