This talks about connections.
My understanding is that while brain cell death (outside of the hippocampus, at least) cannot regenerate, the connections and networks can.
But neurons regenerating connections between each other is, afaik, been pretty mainstream for awhile. The brain can't generate new cells, but it can rewire the connections between them, is what I understand. From reading the article, it seems to only claim rewiring connections, not regenerating cells.
There are a ton of upcoming drugs that help stimulating rewiring, for instance:
https://www.nia.nih.gov/news/new-drug-candidate-targeting-sy...
https://pmc.ncbi.nlm.nih.gov/articles/PMC8190578/
https://www.medicalnewstoday.com/articles/324410
etc.
There is lots of neural regeneration in the brain at the cellular level. The science on this is changing quickly.
But even though there are new brain cells growing, that does not mean you can reform lost structure.
Lion’s mane mushroom and extracts are used by boxers to repair their brains. But it cannot be patented.