Your link says the earth water ball has a diameter of 860 miles. Titan has a diameter of 3200 miles. (https://en.wikipedia.org/wiki/Titan_(moon) https://en.wiki

Your link says the earth water ball has a diameter of 860 miles. Titan has a diameter of 3200 miles. (https://en.wikipedia.org/wiki/Titan_(moon) https://en.wikipedia.org/wiki/Titan_(moon)) So Titan is 51x the size of the earth water ball by volume. If the oceans are much deeper, then it could genuinely have 12x as much water.