Sorry, but they are not open primaries.
Sorry, you are mostly right. Republican congressional and state primaries are mixed. 36% of the state voters are unaffiliated (the largest group of voters in the state). Unaffiliated swing voters may choose which party’s ballot they will vote on. These Unaffiliated voters are the ones that keep electing RINOs in primaries.
So, in a way we are both right.