Real life doesn't work in absolutes, "if" or "can" are very big words.(I thought that viability went way down after a week or two in the fridge but I guess not!?)
Even stored in perfect conditions eggs can lose viability the longer they are stored. How fast they lose viability (the ability to develop and hatch) depends on how they are stored and on the individual egg. Some eggs are just stronger than others. I know you read on this forum that putting an egg in the refrigerator means it absolutely cannot be hatched. That is wrong. The further you are from ideal storage conditions (either too warm or too cool) the faster they can lose viability, but many eggs stored at room temperature or in the refrigerator maintain viability pretty well.
it sounds like it is working out very well for you. I'm glad. Here's hoping for the best.