The mechanims shown is dissicative since the intermediate has a lower coordination number than the original metal complex.
Only one product forms when the intermediate is square pyramidal. Compare with the other animation when the intermediate is trigonal bipyramidal. https://skfb.ly/ovRo7
Graph based on :
https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Inorganic_Coordination_Chemistry_%28Landskron%29/09%3A_Coordination_Chemistry_IV_-_Reaction_and_Mechanisms/9.01%3A_Substitution_Reactions