bitcoin would definitely be destroyed in my opinion, people would be selling it because they would think that satoshi will sell his bitcoins
If satoshi did not sell all his bitcoins when the price hit an all time high of 1k+ dollars 3 years ago, there's no reason to sell them now.
That's not sound logic at all. There are near infinite possible scenarios that could explain why he didn't sell back then and there is no guarantee that he won't sell in the future. The more Bitcoin users there are, the higher the chances the market could survive the dump. If Bitcoin had been inflationary, eventually his 1 million would've become insignificant. However, because the total number of Bitcoins that can possibly exist is finite, the 1 million Bitcoins will always have same tremendous power and the resulting damages from a dump will always be severe.