Been there, done that, did that.
Why should he not do that, it is a proven method that has been around a lot longer, and has a lot more followers than the GedLee approach.
My results following Toole and Welti's approach, as well as Ian, Jakeman, Craigsub, etc. have brought about much flatter response then the GedLee method, and they are much easier to accomplish.
ps: i forgot to mention bass traps and frz's in the equation are a must.
SMS-1 graph with 'NO' eq added after following the methods I described above with my ep600 and twin ep350v3's.