I think that was just a marketing ploy, based on Zanussi's idea of having a downward-firing water jet on the bottom spray arm.
With the Zanussi method, that bottom arm water jet swept down the hollow, central funnel of this filter, out through the bottom hole between the 'press to release tabs'. This filter sat inside a cylindrical nylon mesh filter, hence the release tabs.
The water jet was supposed to assist in dissolving detergent in the sump.