So what decaf isn’t ?

Citation needed, swiss water decaf isn't the only type of decaf on the shelves at my local grocery store.

This isn't really true, there are a few different methods to decaffeinating coffee beans:

"Like regular coffee, decaf coffee begins as green, unroasted beans. The hard beans are warmed and soaked in liquid to dissolve and remove the caffeine in one of four ways: using water alone, using a mixture of water and solvents (most commonly methylene chloride or ethyl acetate) applied either directly or indirectly, or using water and “supercritical carbon dioxide.”"

-> https://www.ncausa.org/Decaffeinated-Coffee

We drink a lot of decaf and I email roasters before ordering to see what method they use (even though it's stated that methylene chloride is "totally safe"). It seems most commercially available beans are processed via this company: https://en.descamex.com.mx/ (which does both: https://en.descamex.com.mx/mountainwaterprocess)

Even our local coffee roaster replied and said they only use Swiss water process on their more expensive organic beans - the rest of their lineup uses MC.