would have to be proven in a series of identicle tests. That being said I do add a bottle at every oil change. It's on the counter at my Napa parts store where I buy my Amsoil and Napa gold filter. So I always grab a bottle at the counter.
I also agree that it is impossible to electrically kill an injector with fuel system/inj cleaner. the two sides of the inj unit are seperate. Fuel doesn't enter the electrical side of the inj and therefore has no effect on the coil.