Well sure Listeria which lives in milk and water, and is found in pates and bologna. CDC recommends not eating a bologna sandwich unless it's cooked first, but I bet most of us survived a childhood despite this risk. It is not found deep in the animal tissues. Any that might survive on the outer cut of the rib roast will certainly be cooked by the blowtorch finish, and will not get into the rest of the meat.
E. Coli comes from animal feces. It doesn't take a lot of animal poop to get in your mouth to make you sick if it is infected with the bad strain of E. Coli (there are other strains that are not harmful to humans). The bad E. Coli produces a toxin called Shiga toxin. Luckily, the prime rib is located far and away from the intestines of the animal and are safe from it's fecal matter (unless really poorly butchered). If you buy a whole rib roast, there will be no chance to get the Shiga toxin into your food, unless it was poorly butchered - in which case the toxin would be on the outside of the meat and would be subjected to the blowtorch.
C. Botulism: (from the CDC) The bacteria that make botulinum toxin are found naturally in many places, but it’s rare for them to make people sick. These bacteria make spores, which act like protective coatings. Spores help the bacteria survive in the environment, even in extreme conditions. The spores usually do not cause people to become sick, even when they’re eaten. But under certain conditions, these spores can grow and make one of the most lethal toxins known. The conditions in which the spores can grow and make toxin are:
- Low-oxygen or no oxygen (anaerobic) environment
- Low acid
- Low sugar
- Low salt
- A certain temperature range 38F-118F
- A certain amount of water
By keeping the meat refrigerated then heated to a temp that will kill off this critter, you will be safe.
But if you are really concerned about food safety, I'm glad I didn't show you this...
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The far right is steak tartare. A raw egg on top of raw beef. They serve this monstrosity in restaurants. It is delicious.
It's also mostly safe (people that have weakened immune systems may wish to steer clear). Don't be that guy that lives in a bubble because of fear. Learn all you can and make informed decisions. The website you linked isn't bad, but it comes up well short of a biology degree.