Nope, the situation is still unchanged - Prague is now THE LAST zoo in Czechia that still keeps mixed breeding flock of flamingos. All other zoos have already switched to only one species per enclosure, even known obscessive species-collector like Plzen sent their last Chileans away to keep just a single flamingo species!. In Prague, Greaters live separated. But Caribbeans, Chileans and hybrids are kept together and let inbreed. Just yesterday I observed mating of a Chilean/Caribbean mixed pair and some of the adult hybrids are in bonded pairs.
Maybe you remmember that when we met many years ago, I went on a long angry rant about the bird curator and his absolute disregard of good husbandry of flamingos? I guess he probably gives more dam even about rats that occasionaly swim over flamingo pool that to the birds there. No progress on his part.
But there are two changes for the worse since. First, both flamingo enclosures now look more like dark jungle that open areas for sun-loving birds. You know the Greater flamingo pen is small, maybe 150 m2, with over 80 adult flamingos - that is overcrowded already by simply its size. But over last years, trees and other vegetation was let to grow so much that 2/3 of the exhibit is unusable for the birds, in part simply impassable. Only maybe 30m2 get direct sun during the day and that is the place where all the birds concentrate. The exhibit with American flamingos is a little bit better, thick vegetation (partly thick bambus, partly sone bushes) obscures "only" 1/2 of dry land there, but untrimmed tall trees surrounding the exhibit are shading also here majority of the area.
The second change for worse is develomental damage seen in chicks that hatched during last breeding seasons. You can recognize them not only by partial coloration and yellow rings, but also by "dwarfism" and non-straight legs of some. Many chicks actually developed so badly, with so curved legs, they had to be put down at few months age. Food must be high-proteine and low calcium/vitamins to grow so badly. Another reason might be that shade in enclosures - once chicks form creches, they move at side of the flock of adult birds and if they try to mix, they get pecked by unrelated adults. Adults concentrate at that single place that gets direct sunlight (which they love and bitterly fight others who would want to get their place) while chicks are forced to spend all their first half-year in the thick "jungle" parts of enclosure without access to any sun and that affects processing of calcium in their bodies. With sad outcome.
Yesterday, while I watched both flocks, I was seriusly thinking what tools you would need to trim which tree branches, which whole trees and bushes need to be cut down completely, if there is way to prevent bambus offshoots to propagate to cleared land (maybe mixing salt into soil). Unfortunately I dont have guts to simpy break in during night and make the much needed gardening that is overdue at least 10 years.