You are so dumb it hurts. You are making a fundamental assumption: that the probabilities you lifted from Nate Silver are independent. The reality is that they are not. Instead, they are joint probabilities. That's why in the same piece Nate Silver mentioned the numbers that Rojo (and you) are confused by.
Nate Silver is a fraud. The best pollster in the biz is Rich Baris.
Textbook Nate Silver, using pseudo-statistical arguments with no empirical evidence to argue that he will be right no matter who wins.
There is no evidence pollsters overcorrected: 1) the primaries don’t support that and 2) disparity between Media/UNV & IND state polls persists. https://t.co/CBMPJTkpYU
— Rich Baris "The People's Pundit" (@Peoples_Pundit) November 4, 2022
Because the probabilities that the Democrats win the House and that they win the Senate are not independent events - in fact they are highly correlated. In a world where Democrats did win the House, there is virtually no chance that they lost the Senate, because that would mean Democrats are significantly outperforming expectations (i.e. a larger percentage than expected of those voting are choosing Democrats).
I realize that you probably completed a rudimentary probability lesson during a high school math course once upon a time, but that doesn't somehow make you cleverer than actual statisticians. You're just a massive victim of Dunning-Kruger. To be fair, that seems to be your thing.