The “green man” you are quoting is for the crossing which is on the left out of view and not for the one you are facing.
However, I have always said that these type of crossings are dangerous.
The signs showing the green man are now mounted at chest level with the button.
The problem with this is that if you have a queue of people you can’t see the green man.
If you then get someone in a rush who crosses when they shouldn’t this leads to people following them.
Obviously when they were mounted up above across from you everyone could see at a glance when it was at green.