I think they were more referring to the 212 degree heat thing as being destructive to bacteria/viruses that are most often considered harmful to humans and take residence in water.

The ones you listed are mostly related to food poisoning (of all things) and are more of a reason to cook your food thoroughly than in relation of trying to purify water. Here's a list (per wikipedia)

Bacillus anthracis is a Gram-positive, facultatively anaerobic, rod-shaped bacterium of the genus Bacillus. An endospore forming bacterium, B. anthracis is a natural soil-dwelling organism, as well as the causative agent of anthrax.

Bacillus cereus is an endemic, soil-dwelling, Gram-positive, rod shaped, beta hemolytic bacteria that causes foodborne illness.

Bacillus coagulans is a species of lactic acid forming Bacillus bacteria, which can contaminate canned food and gives it a flat sour taste.

Clostridium includes common free-living bacteria as well as important pathogens.[2] There are four main species responsible for disease in humans:

C. botulinum, an organism producing a toxin in food that causes botulism.[3]
C. difficile, which can overgrow other bacteria in the gut during antibiotic therapy, can cause pseudomembranous colitis.[4]
C. perfringens, causes a wide range of symptoms, from food poisoning to gas gangrene. Also responsible for enterotoxemia (also known as "overeating disease" or "pulpy kidney disease") in sheep and goats.[5]
C. tetani, the causative organism of tetanus (lockjaw).[6]

Just trying to make sure this doesn't cause confusion for some.
Good info nonetheless