First of all, ADA Amazonia is made of clay. Clay does not "go bad" or deplete in minerals over time. It never will because it's clay and clay is made of minerals that have been compacted together. Amazonia is simply clay that has been formed into spheres and heated to high temperatures so that it retains its shape, like clay bricks. As long as there's still clay visible, there's still minerals, because that's what clay is.
Secondly, you shouldn't rinse out the old substrate since this will destroy the microbiome in the sediment which takes months to develop and find its niche. The substrate is an entire ecosystem on its own. It is not a Dupont carpet and shouldn't be treated like one.