Supplier offers it as a natural “substitute for water” that can preserve natural products. As water is assumed to be natural, think it would be hard to explain why one would replace it with an much more expensive material other than to preserve.
Subsequently elaborated - they’re targeting small producers who can’t control the quality of their water. Think most of us understand the position of the EU and FDA - “preservatives” should not be used to correct for failed GMP’s. Those with experience know they are not effective in that context.