I think the argument is that this isn't some unknown new untested discovery but instead something well known and constantly studied with disappointing results.
> The traditional eye exercises of acupoints appeared to have a modest protective effect on myopia among these Chinese rural students aged 6–17 years. However, no association between the eye exercises and near vision symptoms was found.
You could say that for everything for which there was no treatment before and for which the problem is now considered solved with modern practice.