This is likely a very good and important information for people suffering from Cystic Fibrosis and could be something like a “cystic fibrosis cure” or a “cure for cystic fibrosis”, as it seems to be able to at least improve the condition or “reverse it”.
I think one should take this Dr. Artour Rakhimov very seriously, see
https://normalbreathing.com
and see his book
https://www.amazon.com/Cystic-Fibrosis-Life-Expectancy-Childrens-ebook/dp/B00793UMNQ/
All this is based on the extensive research activities by Dr. Buteyko (in the 1960s already) during the soviet space program, aka "hard science" (or "real science", if you will)!
Oh and combining this method with the oil-protein-diet by Dr. Johanna Budwig is most likely extremely recommendable
https://inclinedbedtherapy.com improves lung function.
If you know someone suffering from CF please forward this to him or her, thanks!