I think you have mistaken "normalization rules" in this context with Unicode normalization algorithms. I'm specifically talking about documents like [1], which are essentially more detailed and concrete versions of the original Han-unification rules.
(Note that normalization rules themselves are distinct from the eventual unification. It takes further works to actually decide whether the unification is possible or not.)
(Note that normalization rules themselves are distinct from the eventual unification. It takes further works to actually decide whether the unification is possible or not.)
[1] https://appsrv.cse.cuhk.edu.hk/~irg/irg/irg53/IRGN2420_KRNor...