Un-Safe Sea Jellyfish Lotion - OceanLine's Titanic Thailand Omission

For almost 10 years, OceanLine - the Phuket-based importer and distributor of Safe Sea Sunscreen with Jellyfish Sting Protection - has been claiming that this product is effective in preventing stings from jellyfish. In one breath they say it "protects the skin against jellyfish stings" and in the other it "helps protect against most jellyfish". Well, which is it? All or most?