the word you were looking for was probably “psychoactive” not “neuroplastic”
The whole point of the article is that psychedelics increase neuroplasticity within the brain, and that pharma companies are trying to synthesize a molecule that does exactly that, but without the hallucinations.
Here's the article in question - perhaps there's something I missed that you might understand better than I do: https://www.nytimes.com/2022/07/15/opinion/hallucinations-ps...