The microbes can cause damage to the tank Mountainbear.
Since you seemed to have missed my point entirely let me try again.
Link a single accident report anywhere in the world where fungi in the fuel supply--either directly or indirectly--lead to a loss of life.
I know of none. It seems hyperbole to claim that this is a "serious" or "severe" problem from a safety perspective. Even if you want to argue that, left untreated, it would become a safety issue that only speaks to the fact that present methods seem to be taking care of the safety aspect nicely, thank you very much.
None of this should be read to disparage the inventors knowledge. It may be the case that there are real cost saving involved by adopting his product. That amounts to a claim that product X is better than product Y. I don't know enough to judge
that claim.
What I do know is that given all the real issues in flight safety--CRM, automation, exploding Rolls Royce engines--attacks by the mutant fungi from outer space are low on the list.