There were plenty of recommendations to all parties, and the filter manufacturer improved the design of their system. Overall, I think the fault lies on the airport operator for sloppy construction practices followed by sloppy inspection and flushing of the system. The fueling operator also suffered from a bit of sloppiness in not investigating the blockage causing the pressure drop.
A fair summary
my problem with all this is that the large transport aviation community doesn't really have a regulation in their books that covers all this, thus the recommendations are just that, no hope of being mandatory.