His "cost me $200m" is of a $20b company, so by the math he's suggesting he would've had 1% of the company after it went through all the dilutions on its path to $20b.
So yeah, if you have a chance to get nearly a cofounder's amount of equity in a company that will end up 20x a unicorn (which got that name because of how rare they are), then definitely go for it.