To answer your first question, AWOL is also used colloquially to describe people wildly or destructively ignoring the responsibilities of their job. So it’d be an apt descriptor if it was talking about a REAL priest but in this case it’s just flowery wording (presumably for alliteration)

It doesn’t get a whole lot of attention but it’s the most mature open source authenticator app and one of the first ones you would find in fdroid. With that said, there’s nothing really standout about it or its features, it just works.