The guide is very confusing. Between syntax errors and, yes kind of confused.
I was able to ignore most of this, but started having troubles with my character as I tried to level from four to five using this glitch. As a few other people have done it properly, I can't say that the guide is wrong per se, but it isn't working for me.
You point out how scoundrels get feats at "5, 8, 11, and 14" and then later contradict yourself by instructing us to wait until level 15 to get the feat, "master flurry." After trying it twice, following either of your contradictory instructions, I thought maybe that was level 14 in scoundrel levels. That didn't work either. None of those three possible combinations yield feats which stick. 11+3+1=15. No feat at effective character level 15. 14=11+3. Doesn't work. 14+3+1=18. No feat at effective character level 18.