They also say 50 years in the title and <=10 years later: "In the past decade, another ocelot, named Lil' Jefe, has been spotted roaming in the state, the Arizona Republic reported"
It seems pretty safe to say there's a breeding population of them.
It does make you wonder if the Tasmanian Tiger may yet be found to still be around, given the way more remote and easy-to-hide-in habitats where it may be expected to be found.
> This was the first time an ocelot has been seen "in the Atascosa Highlands region in at least 50 years," the zoo said.