I think he thinks he's answering but has probably been given a script with which to address these kinds of "Social media" advertising type questions. @E-Money, if my translation of your answer is inaccurate please correct me but I think what he (or she?) is saying....
They buy from the flavor manufacturers, TPA,Cap, FA, etc.... Then
Then they make a flavor stone which they normally use to make their juice but now we can buy the stone and DIY it for ourselves.
I often mixed their Strawberry Waterfelons with a locally made vanilla flavor back when I was mixing retail juices. I have no experience with this company over the past year but I never found anything nefarious about them.