That was the reason cited in this article:
Habitat or humbug?
I agree the criteria requires more flexibility, especially now they expect species to satisfy two of the five criteria. Enabling is so subjective. Anything can be enabling if you sell it to people.
Recovery - threatened species recovery programme, preferably reintroduced to the wild.
Ark - species under threat of extinction in the wild and part of regional and international breeding programmes.
Ambassador - the face of a conservation campaign.
Enabling - species that engage with people and form emotional bonds.
Research - species that support the research of Zoos Victoria for the improvement of animal welfare.