It is theoretically possible to perform organic synthesis with petroleum feedstocks to produce an artificial chemical mixture indistinguishable from natural aloe juice. But that would not be aloe, either. It would be imitation aloe. There is nothing inherently wrong or bad about imitation products, provided they are not presented in commerce as the genuine article. It might, after all, be an inferior and imperfect imitation, which would not be acceptable to consumers at the same prices.
The important issue is that people may believe that the bottled product is substantially similar to cutting a leaf from an aloe plant and squeezing out the juice from it. It is whether they are getting what they thought they paid for. If no chemical can be found in the product that can only economically be sourced from an aloe plant, clearly, the consumer has been cheated.