A true autoclave process is what you describe. To your point, though I don't state this in my description, I do heat mine to 250 deg. F for 30 minutes then reduce heat to 220 deg. F during the boil process prior to filling. I didn't say this in the original description because I didn't want to confuse people more by adding temperature adjustments through the process. I'm confident that the temperatures achieved are sufficient to kills any/all the Staphylococcus and other bacteria that are in a "normal" kitchen.
'fraid not. You're heating it to 250F in a dry environment. Sterilization with that setup would take ~12 hours. You aren't even coming close to killing bacterial spores.