"
It would be great if Dr Harch would publish his results."
As far as I can see from PubMed Dr Harch has published 14 papers over the period 1994-2017 (search string "Harch PG").
The most recent one (2017) is a case report of a young child who was treated with HBOT after a drowning event (
Subacute normobaric oxygen and hyperbaric oxygen therapy in drowning, reversal of brain volume loss: a case report. - PubMed - NCBI).
The next most recent one (2015) seems to me to be largely polemical in nature (
Hyperbaric oxygen in chronic traumatic brain injury: oxygen, pressure, and gene therapy. - PubMed - NCBI).