What filters?
The module according to settings will update the count for all combinations according to the main product.
It works in the background, whenever the Prestashop function is called to change the number in stock available.
This means that if someone buys a combination of, for example, red, the others, for example, green and blue, will have the same number. In this case, the total sum of the attributes will be the same as the number in the combination.
In short, it's the same as you need.
Combinations: 9 +9 +9 = 9 !!!
Product: 9 = Combinations: 9 + 9 + 9 !!!
Otherwise, it will be necessary to create separate products from the combinations.