Depending on how many days it took to lower the salinity, it can take an additional week or so to see results. Hyposalinity does not affect the free swimming theront or the trophont on the fish. It prevents the tomont from completing it's reproductive stage.
Are you checking the salinity levels several times each day and additing top off water as needed? If the salinity is allowed to climb, any surviving tomonts can rupture and infest the fish anew. As water evaporates, the salinity climbs so this is very important. @ 1.009 on a refractometer you should be at 12 ppt
salinity, there's really no way it can continue to reproduce at that level. Hyposalinity will be effective at 14 ppt