in theory, it would be enough to throw out the cargoship in the required technologies...
but the problem is deeper :
"Based on recent updates for the "Planet Pelagos" mod for Factorio, cargo ships were removed or modified to allow for diesel-powered operation independent of the mod. This change, along with adjusting how ships are unlocked, aimed to improve compatibility and allow players to use the mod without needing the full, original configuration.
Modification Details: The update removed the next_upgrade field from the diesel assembler, indicating a shift in the progression logic for ships within the mod."