That's correct. However, I seem to recall that even though an app developer make the app "secure" including screenshoting if I also seem to recall if you root your device you can also get some lower level screen capture and/or screen mirror apps as mediators, with the resulting effect that you can still do it even though the app has universally restricted it in some manner while the app is running. If I'm also not mistaken there is a though it two you can do if you have USB going live, but most of this is going into overkill
Or, I thinking about, or we're talking about, two different things