Juanito's mother and Ninka's father were siblings so we can assume Adelaide's pair were never an intended breeding pair - more a non breeding pair with both closely aged wolves living together as companions for one another.Juanito was then transferred to Adelaide Zoo in 2018, but as of November 2024, Adelaide only had a female (Ninka) suggested Juanito has since died or transferred out (possibly back to Altina).
He was born 2014, so it’s not difficult to imagine he’s passed on as the Adelaide pair (half-siblings) appeared to get on well and Ninka is past prime breeding age.
As far as I can remember, Adelaide have held just Ninka for a while now (perhaps the last few years at least). It's possible Juanito may have been transferred back to Altina as he was/is still on the young side.