ATF does not provide any lubrication for the system. There are detergents in there. People will sometimes run ATF through the system in hopes to clean injectors out.
So why is ATF recommended? It sounded like both the ATF and the 2SO were recommended for the same thing, unless I completely misunderstood their purpose(s). My thought was that either one was OK for lubricity in the fuel thus helping keep injectors and seals in good condition.
Yup, exactly what I mentioned in my postThe ATF works more as an injector cleaner from what I can tell.