Even if that port doesn't matter the blockade is still taking the colonialist entity from being along the route between Asia and Europe to being at the tail end of a new and much longer route with smaller throughput.

Are there as many ships going there now that ships are in smaller supply and the nearby countries could all be served by Chinese/Russian or even their own ships going straight through the Suez? I don't know the numbers exactly but I doubt it's something they can just brush off.