That is because, as myself and others have pointed out to you, UNTIL the West Car Park at Bristol is SOLD , they have no money to develop Wild Place and at present they still DO NOT have planning for the main site or the West Car Park, so no offers have been made, nothing has been sold.
They are not planning to open the rebranded zoo until summer 2024, which is 20 months away, so there is no hurry and as stated previously, the chain of events is planning needs to be approved at Bristol, then West Car Park sold, THEN and only THEN, will development start at Wild Place.