No. Candy is heated to extremely high temperatures while processing and has a low water content, which are very important for its sterilization and entirely different from something like this. And candy still goes bad if you wait long enough… Candy is more equivalent to something like fruit preserves/jelly, which use heat and sugar to sterilize and preserve, yet which still have to be refrigerated to maximize shelf-life/minimize contamination. So you’re right that sugar can be used to preserve, but only by following a very different process.