This is a very important point to make because it starts to devalue the warning and desensitize people to it to the point of meaninglessness.
If they wanted sediment, it would be cheaper to just add some of the actual fruit sediment they already have from earlier in the juicing process, rather than purchasing another ingredient.
Are you sure it isn't used for the opposite reason? Silicon Dioxide (silica) can be used as a suspending agent, so seems like it may have been added to prevent the natural sediment from collecting at the bottom.