If it’s still sealed in packages, there is very little moisture inside to condense. Condensation is only an issue when a cold object is exposed to a large volume of warm air.
Also, I think any packaged non-perishable food is OK to refrigerate - they are intended to be transported by regular trucks, which are’t climate controlled, and get pretty cold in winter.
Anything can be made non-perishable by cooking and packaging in sterile conditions. Canned vegetables are non-perishable, and they are just as healthy as fresh vegetables.
Also, any food that has a high salt or sugar content, or very little moisture, last a long time. Which is why the “McDonalds hamburger never rots” experiment works - hamburgers don’t have much moisture in them, and they dry out before they rot. It has nothing to do with unnatural preservatives.
Though depending on your dietary needs, a granola bar can be pretty unhealthy - they are all pretty high in sugar. Some are high in fat as well.