I don't understand why someone would post bad directions like that. Also they are very similar to Doomlord's own instructions for rooting. He says to flash an old exploitable kernel and then run his exploit and then flash back.
Anyways, your method says to downgrade to .67 firmware, and I can't find that anywhere. Can I downgrade to .423 firmware and use Doomlord's root method instead? Should be the same results, right?
Also, is step 8 necessary? Do I have to flash back stock recovery or can I keep CWM?
And finally, using this method, how will we keep root when 4.4 finally arrives?