syntropic gardening

ok, my new word of the day is syntropic. im still trying to get it all to sink in. in a practical application manner. is this practice just for the tropics? Or, umm, can it be applied where there are 4 distinct seasons?
im open to hearing any and all definitions and how it applies to how and what you grow.

Syntropic gardening = edge gardening, silvopasture/alley cropping, growing shorter vegetables next to taller fruit/nut trees. It also means less chemical inputs and more natural imputs even better if the are onsite inputs that have a positive feedback loop. It very much sounds like a food forest/prairie/savanna.

So if they are basically defining a alley cropping/food forest system, with legumes/animals that provide nitrogen vs chemical fertilizers and predatory insects that eat say aphids vs chemical pesticides, how does that not sound like they are defining a permaculture food forest, and if so why would it be limited to only the tropics.

I wonder if syntropic gardening to you implies that they will return the system back to a tropical rainforest with 300ft trees with dark forest floor? At most it would return it timber land that is cut every few decades, which sounds like silvo-pasture/alley cropping at best.