How to remove this bathtub diverter spigot?
you have to slide the white plastic tab towards the mouth of the spigot.  its essentially like a quick fit pneumatic fitting.  its a spring loaded compression fitting.  sliding the plastic tab forward against the spring pressure releases the seal and lets you slide the spigot off of the wallpipe.  you can twist a little to make it easier and lubricate with dishsoap to get it to move.