I mean that they are falsely practicing medicine. They're giving medical advice, no matter how much they try to deny it. One man's "advice" is another man's commandments.
TonusOH, the commandments they gave your mother constitute medical directives; they were acting as though they were qualified medical professionals, even though you quite rightly identify them as quacks. If only the various medical boards could go after them for illegally practicing medicine 💊💉!