What is your opinion?
Dead brain cells don’t “come back”. Ever. Dead is dead.
Perhaps some rerouting can occur, but the information that was contained in the dead cells is gone until re-learned.
JMHO, YMMV
If it is a hoax then there are numerous “actors” who are willing to support that quack “doctor” including another physician.
https://www.youtube.com/watch?v=3fqq5GiDU8M
Just another S.Florida scam...looking for grant money.