He's talking about both native and non-native. An individual person releasing (native) amphibians is potentionally a much worse crime against nature than collecting a few and keeping then until they die. Does not matter that much if they live in seperated enclosures or not, because that's not garantee of not spreading pathogens.
According to some articlea I've read, at least some scientiests belive that one of the problens with chytrid and its global prescence is that people have released native species they've kept, after they've been exposed to chytrid via theie more exotics pets.