It looks exactly like the design except shot on a miserable day in November. Hardscaping is done, main trees remain, planting might be done early next year when it makes sense.
In any case, biodiversity is something you do down in a re-wilded farm in rural Cork, unless you think bees like Hillbillies.
I’d imagine Cork City centre was never grass to start with given much of it was canals and reclaimed from the harbour, might explain lack of green spaces since. It does have said big harbour and two rivers going through it though, these things have had orcas and otters in them. Very nice spaces up around UCC as well.