what a long winded theory.
As far as I can make out it`s just basic subtractive EQ theory, made exceedingly complicated.

In a nutshell you can abbreviate to this.

Use a multiband EQ on your bass, to make sure there are no clashing frequencies between it and the kick.
Boost and sweep to find over resonant frequencies, then cut these frequencies.
Fint the "centre" or main frequency area your kick takes up, and pull back some of this from your bass.