I mean having read up on the situation the zoo has not been transparent in the past. This will replace the muntjac/crane exhibits but in the past the zoo has gone forward with expansions into public parkland with little notice or comment. Now I think there is a nice medium but if I remember correctly there last project that was canceled was a 7 million dollar amphitheater that would have eaten into the parkland, and the zoo had to cancel it because of how deeply unpopular it was (and how it was largely public money). The article definitely is petty and has rather stupid critiques but the zoo really has refused to establish an official boundary of its site, as I imagine they feel this boxes them in, yet at the same point it brings a lot of negative response in the same community that funds it.
To my earlier point though there are definitely ways of create larger exhibits for both species on the existing site, sadly this is just a trend with many of the exhibits at the zoo (especially for cats like the existing leopards).