You are repeating very OLD news. Those warning exist only for those who still might have an old vehicle with natural rubber fuel hoses and gaskets.
Heck, even my old 1935 Minneapolis Moline uses cork because it was MADE to run on alcohol.
6.9l Navistar injector pump failed a couple of months after we went to 500ppm sulfur fuel. Truck was down for about 2 weeks because the pump shop was deluged with work. Almost $400 and I carried the pump in to them. The good news is that ate my Christmas bonus that year.
Dealer? $1500 if they had done it all? $2000?
And it helped how?