Yes. Your math is correct. That means there has only been one man eliminated from the 20-person cast while, on the other end of the spectrum, only three women are even left competing for the $1 million prize.
Were the seven women voted off the island because of their gender? No, not necessarily. But you can't deny there's clearly something wrong when Mark Burnett and Jeff Probst have to implement a 10-person jury just to ensure some equality in editing post-merge.
With that said, we're hearing fan favorite Michaela Bradshawis one of the bring-backs for Season 34 this spring… but still. C'mon, guys.