I inquired HP HC regarding this, but he does not have any opinion, so I will give my 2 cents about this - this is my opinion as someone who is not nearly as spiritually elevated or informed as more advanced members. I will also quote
@HPS Lydia who might know things about QiGong.
**Assuming** on the premise they are legit:
*A strict moral code and not mixing other practices may be extremely needed for the overall population, so this does not happen what happened to yoga, in which it became popular and attracted all kinds of people, including weirdos, far-leftists and new agers who give yoga and spirituality a bad reputation.
*A lot of weirdos, from new ager leftists to LHP edgelors, desecrate Tantrism as some fetish to satisfy their needs. In the Falun Dafa book, although it defends sexual modesty, it says Tantra is a
legit way of cultivation, but people with "lower development" might make it something malignant. In the book he stated who "does not need to become a monk, but follow their matrimonial life normally, and once they are advanced enough they will know what to do with their sexuality".
*The practice was "made public" in the 90's, an epoch with an overdose of new agers, corrupt LHP, or people into enemy ET's, so the author made it to exclusive only do the Falun Dafa practice, and not to take teachings from any entities even if they appear "Godly", as that might corrupt their gong, which makes a lot of sense. See the amount of nonsensical and even dangerous shit that got into yoga like dangerous locks with tongue or bizarre diets, from enemy entities posing as Gods or Buddhas.
*Obviously this applies only to those who are without and need *any* spirituality like QiGong or yoga to not be entirely dead, and are spiritually undeveloped and not open to the True Gods - this does need to be applied to us who are in contact with the True Gods and Deified Humans (the true "Daos" and "Buddhas" who will not give false RHP or LHP spirituality etc.)
*Yoga was public to a world where everyone had to figure out for themselves without any context of what true spirituality might entail. A lot of people out there have shitty karmas and dirty auras, and since the practice don't make use of mantras for cleaning or something like that ("mantras" could potentially be seen as magic and ward off outsiders from the practice), a strong moral "code" could be needed to avoid further negativity and polution, and a warning to karmic backlash as an expected side effect coming out of the practice without being scared of spirituality (like idiots who think they're being "possessed by demons" from yoga and whatnot).
*New age cults go around "healing people" without any understanding of what it could entail, so people outside the JoS are not really ready to use magic to heal people (which could create personality worship and really not "save" people, or harm the people trying to do the healing), or magick to curse whoever they want without understanding how energy and karma works.
*Also because some more morally conservative people are stuck in enemy religions and relate spirituality with leftists. Linking QiGong practice and Spirituality with traditional Chinese family values and being opposed to Communism seems like an important step to make. We are talking early 90's here so people deluded on either sides of the enemy spectrum didn't know any better. It has been stated some secret spiritualists in the Middle East pose as islamists but hide their secret teachings.
All that being stated, this is very, very speculative, based on the large influence it had in Chinese society to the point the CCP had to brutally persecute it violently. This could be the Gods guiding through unseen means, as well as being total enemy bullshit as fake opposition to judeo-communist atheism, which I find a bit hard to believe and not a coincidence that HPS Maxine became aware and wen't in depth with their plea:
https://joswiki.org/index.php/Communist_inquisition:_torture_of_spiritual_practitioners