Actually, looking at the Fleetwood Port Plan, yes it is. The Ro-Ro hasn't run since 2004, and the west jetty is now houses, built by Redrow. Similarly, the area marked as 'dry berthing / storage compound' has recently been overbuilt with new houses. ( https://www.google.co.uk/maps/@53.9172036,-3.0115474,1054m/data=!3m1!1e3?hl=en-GB&authuser=0 ). Recently they have started putting up yet more housing on the area south of the port, marked as 'Area for Development'.
Fleetwood does still land fish, but in such small quantities that it doesn't register in the official statistics, https://www.gov.uk/government/statistics/uk-sea-fisheries-annual-statistics-report-2018