Well, yes and no. Its true once you get beyond about 12C potency on the centesimal or "C scale", there may not be a molecule of the original substance left.

However lower potencies, specially in the decimal scale definitely have enough of the original remedy in them as to qualify as a microdose. If you start with a gram, then a 6x potentization will result in about a 1 micro-gram dose, which is about the same as being discussed in this article. And a lot of homeopathic remedies are administered at the 3x or 6x potency as well.

https://en.wikipedia.org/wiki/Homeopathic_dilutions

Well, not exactly, in the sense that many homeopathic preparations don't even contain any molecules of the substances they supposedly 'remember'[1] while the studies being discussed in the article are using doses of LSD about 1/10th what a typical full-strength dose might be.

1: https://en.wikipedia.org/wiki/Homeopathy#Dilutions