I don't understand his take on the Senate. That is not close to 50 to 50. Maybe 25 percent, 30 percent chance tops. The way I see it there are 15 races that are not completely over. The Dems need to win 13 of them. They have a huge to pretty clear edge in 9 of them, granted. They have some slight edge in 2 of them and one is truly 50/50 (MO). But all the other 3 have a fairly decent GOP lean to them. I think 11 out of 15 would be closer to an average result from that hand, fully considering how bad the current environment is for the GOP.
The right hand does not know what the left is doing. The Dems will have to get really lucky to win 6 Senate seats, and assuming they hold all their own, they need to get PA, RI, Montana, Ohio, Missouri, and then bag Tenn or Virginia. That scenario is a royal flush.