Those look like class 2 to me also. He is not rigged to flip and if he did that rod in the holder would be gone or toast. For solo fishing out of a boat on rivers I would go with a Infatable kayak, small raft or pontoon boat. Air, Hyside, Jacks plastics SOAR make some good ones. Avoid Sea Eagle like the plague as well as sevlor. But the reality is that you are not going to be able to fish well from a boat solo in most CO rivers. You can paddle or you can fish but you will not do both well at the same time. Also from a practicality and safety standpoint you will need a second person. There are a lot of hazards on rivers and not having a second person to help with rescuing you or your boat when SHTF is a bad idea.
That being said I have been known to float the Rincon to Vallie bridge section of the Ark solo in my IK to fish. Mostly stopping and getting out to fish good spots and then heading down stream. The first time I did it was after doing lots of google fu to find out the beta on the run. I ran royal gorge the in the morning with a group and headed up ther ein the afternoon solo and planned on hitching a ride back up. I got distracted by fishing while paddling. Saw some whitewater coming up, tried to make an eddy to get out and scout it and missed it. Went down the drop sideways, flipped and lost a fly rod. Managed to hold onto the boat and paddle so I was not completely up shits creek. (Not my first swim!) But I always have a spare paddle strapped to the boat just in case I lose one. But if I had lost hold of the boat, went into a sweeper or had a foot entrapment i could have had a shitty day. Got down to the take out and found some rafters to give me a ride back up. Now is where it gets funny. He was a carpenter named Hans... Who had 8 1/2 fingers... When we got on the road was when I realized he was shitfaced.... Best to arrange a shuttle with people you know.