As Topbottom pointed out this is a SB (SB-78), but it will become an AD, and the wording is very plain, change the tanks, 4 years to do it. I think it is the need to stagger the building of tanks to meet the demand that warrants the time delay. As the owner of a 2009 model I approached the factory to get this done under warranty although it was just out of warranty and the factory agreed to do it. But only after a lot of discussion
As said before if you had a safety issue with a fuel tank in any vehicle made today it would be fixed, no cost , no question. Surely some of the big operators with 10 or 20 machines will get together for a class action.