Health: bringing up Helbrans here is quite underhanded. I didn’t watch the long video recently which I think you’re referring to, but no sane parent is okay with their child marrying a cult member. And usually, the child is a member first, and then marries according to their leader’s wishes, regardless of age.
In fact, I heard of a family that actually escaped a few years ago, mainly because their very young daughter was engaged to be married there. (I don’t know the ages of the Chosonim – she was actually engaged a few times; they were made to drop the shidduch and on to the next one. Really sick.) This family lives in your town now, so you can probably find out more if you try.