Stop using the term, you don't understand what it means. Chaos monkey is a form of testing. Testing is not antifragility.
While I can imagine software that is in itself antifragile, I think it's entirely reasonable to include the totality of the people and process that make up an operational system, in which case even your narrow definition applies here.
You are watering down the word so much that it wouldn't have reason to exist. Is every chair-making process antifragile since chairs get stress tested before being sold?
There's a world of difference between stress testing before something is sold or released and welcoming ongoing hostility throughout its lifecycle, and this difference is absolutely in line with the concept of antifragility.