Yes, I would call it a multiple attribute combination. Maybe it's me, but the description seems to imply it does.

'It will work for a virtually unlimited number of amount of attribute combinations. For example, if you offered cotton or polyester shirts in green, red or blue and small medium or large sizes, this add-on would allow you to enter and maintain a separate stock level for each of the 18 possible combinations.'

My client does offer items in sizes and colors with each having it's own inventory. Just to be sure we are communicating clearly, the mod will not allow me to carry stock for each size and color combination?

(thanks for the quick reply)