Here is the rule
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Ports can also be blockaded by ground forces. At least two units are required for each ship in port in order to hold the blockade.
Interpret the rule however you want but it is very straightforward. What other perspectives does one have with this rule? It was implemented simply because some people were not aware that ground forces could blockade a port. And because we decided to make it require 2units per ship. Again this rule has very little to do with this situation. And is simply a case of Jadli not noticing the blockade being lifted and you assuming the port should be blockaded even tho the blockade was lifted, somehow based on a different perspective of the above rule.