The person I responded to stated his/her need:
What I would like to have done is to have those images in the folder that are being taken and in real time duplicate it/them in another folder on the laptop/computer or even on an external USB/firewire drive.
I replied:
An Automator action attached to a Finder Folder should do what you want.
Neither the question nor the answer were about a watch folder as you have carefully defined it.
Equally to the point, Terence did not say that his recommendation would create a watch folder. He implied -- correctly -- that the OP could solve his/her problem by using an Automator action attached to a Finder folder.
The OP _specified_ his/her needs: to " ... have Aperture watch a folder and automatically import new photos". He/She was not looking for a "watch folder".