Lol this dude has 5 million followers on Instagram.
It is 74% if you use correct independent probability btw. And if I'm not mistaken he's using the peak fertility probability. In other words if a couple timed their sex for the optimal window in the menstrual cycle.
I believe it is more like 5-10% in any given month if the couple just has sex randomly. Which is one of my main rebuttals to pro-lifers that act like pregnancy is the expected outcome of sex.
And I get math is hard. And I get that probabilities are even harder for people as they can be unintuitive. But I'm really surprised a dude with a neuroscience doctorate would make such a silly error. C'mon a 120% probability? You don't need to be a mathematician to know you goofed there.