If Caro/McLure (or their employers) offer a payday that’s fine.
If not, it’ll be either an embarrassing retreat or a trial.
Certainly enough high profile defamation cases run (see the Rebel Wilson, Mick Molloy, Geoffrey Rush examples).
It is just a PR press, set up a soft interview with a easy interviewer, run some publicity for it - see the Crow fans in this thread accepting their word as fact already - and they have a book coming out that they can flog at every opportunity. Taking legal action get them some publicity to flog the book and their gig. Grifters.