I don't know if that formula takes into consideration the additional gap necessary on turbocharged, supercharged, and N20 motors. All the additional heat generated by forced induction, changes the parameters for end gaps, I think.
No, it definately does not. However, the piston or ring manufacturer would have those handy as with those extra sources of heat, the effect on a ring will be determined by both the boost level, type of boost, and piston design and material. What did those manufacturers tell you?