This actually wouldn’t surprise me.
The thing then that becomes the obvious question is how did this person develop a conscience in regards to their employer? No one going to work for that site didn’t know what they did yet the moralizing that occurred justifying the leak flew in the face of it.
If what he says is true you now have to look at disgruntled former employees or inter office relationships gone bad or perhaps, not known. Wouldn’t it be ironic if it involved people working at Ashley Madison having an affair that caused the site dedicated to having affairs that brought it down?
Karma is what it is...