I don't know why you're getting downvoted just for asking a question, but my guess is that this process is actually damaging the chemical bonds or somehow break

I don't know why you're getting downvoted just for asking a question, but my guess is that this process is actually damaging the chemical bonds or somehow breaking off any protective oxides so that all of the PFAs end up reacting with the other minerals in the soil so that they change their composition to something that is less dangerous, sort of how sodium and chloride, both potentially dangerous or deadly elements on their own, can combine into table salt which is an essential substance for life. I would like to see a deeper analysis of what is found in the soils after the PFAs are broken up to make sure they haven't just changed one dangerous chemical for another one though. If they are being converted into a harmless salt, then great.