I saw his site too when I was just starting.
I think it's a pretty fantastic site for a beginner. His is one of the only sites that shows pictures and takes you through the entire brew day. That being said, there are a few caveats.
You're right about having a valve. And why does he have like 8ft of tubing coming out of it? He'd only need 6" of tubing if he had a valve... The Stopper is brilliant if he never has a problem with it.
His aeration with the ladle is a bit questionable, but whatever. I wear gloves that go nearly to my elbow and I make sure I stick them into my bucket of StarSan before I handle cool wort or stoppers or whatever is going to likely touch the wort. Heck, with the thick gloves I can stir boiling wort without worrying about steam burns.
Why doesn't he USE the valve on it to dump the wort into his carboy? He looks like he's about to have a hernia holding and dumping the wort. You do NOT want to be trying to pour 50 pounds of wort as slowly as necessary.
He also says he adds cold tap water to top it off when needed. I don't think many people would agree. Your water level shouldn't be a surprise to you--you'll know how much you have as you're boiling. Add to the boil if you have to. Before your first brew with your pot make an indicator stick (I used a plastic stirring paddle) showing the height of gallons in your pot. I leave my chilling coil in for the entire brew day, so I made my indicator heights with the coil in. I just used a sharpie to mark gallon increments, so I always know how much wort is in there.
Obviously, this process is working for him. It's a bit puzzling that he does some rather advanced stuff like saving yeast and using cornies yet he has no mashtun valve and has a distinctively McGyvered chilling coil.
If you already have cornies and CO2, I'd suggest fermenting in them and getting rid of carboys. I used my carboy only 3 or 4 times and absolutely hated it.