Rambam’s special medicine

Hello.
In lesson number 17 on YouTube about mysticism, the rabbi cites the words of the Rambam in Tractate Yoma regarding the specific medicine.
I saw that the edition that appears on the “Library” website has a slightly different wording:
“And there is no halakha like Rabbi Matya ben Harash in that he permits feeding a person the liver of a mad dog when it has bitten, because this is not beneficial except in a special way. And the sages believe that one does not transgress the mitzvot except in medicine alone. R. In things that heal by nature, and it is a true thing, knowledge and experience have brought out that is close to the truth. But to be healed by things that heal by their virtue is prohibited because their power is weak, not from the knowledge and his experience is far, and it is a *weak* argument from the wrong one. And this is the main thing, know it and remember it, because it is a great main thing.”
It seems to me that according to this formulation, the claim about special medicine being a weak claim that is false, means that the Rambam means that the Rambam believes that there is no substance in these remedies, just as he said, “Because their power is weak, not from the side of reason, and their experience is far away.” Apparently, the intention is that the ability to prove the effectiveness of the cure is far away, and therefore it is reasonable for the Rambam to believe that this remedy has no substance, and in any case, this remedy, according to his opinion, would be forbidden on Shabbat.
What does the rabbi think?