Abandoned the theoretical basis.
Its theoretical basis "the theory of repetition" has been abandoned by natural science.
May hurt young children
When children's voluntary action is prevented by IAHP (according to its theory), it may hurt children.
Method errors and exaggerated descriptions
The only published scientific paper by Du Man contains many methodological errors and exaggerated descriptions. His research has no control group experimental design, so it can't be compared.
A lucrative business
This is the Adu method based on outdated and abandoned theories. In China, in the 2nd/Kloc-0th century, China Merchants carried forward and turned it into a very profitable business.
Cherish children
Again, children are not our works, but a gift from God. We should cherish them and be kind to them.