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It looks as if there was only the causeway for low(er) tide, whereas at high tide people would have boarded from the river wall/the steps.
I also found that someone has done a virtual 3D model of the causeway for armchair visitors.
https://sketchfab.com/3d-models/horn-stairs-causeway-8c4297410d634fb89d938989a2c9124c
Made with:
2772 photos taken in February 2020 with a Sony a6000 and processed in Agisoft Metashape.
I think the old ferry left from the end of that causeway, or that causeway supported some kind of pier.
I also found that someone has done a virtual 3D model of the causeway for armchair visitors.
https://sketchfab.com/3d-models/horn-stairs-causeway-8c4297410d634fb89d938989a2c9124c