The very first item that shows up on the "How to Ask" page is
Do your homework
Have you thoroughly searched for an answer before asking your question? Sharing your research helps everyone. Tell us what you found and why it didn’t meet your needs. This demonstrates that you’ve taken the time to try to help yourself, it saves us from reiterating obvious answers, and most of all it helps you get a more specific and relevant answer!
This page gets shown to every user asking their first question on Stack Overflow (and they have to click a checkbox at the bottom saying they've read it, then click "proceed" before they can type in their question).
"General reference" or "too simple" is not an official close reason, except on a couple of SE sites where it has a very particular meaning. For example, on English Language & Usage, "general reference" pretty much means "can be answered by a dictionary or thesaurus" - NOT "can be answered by a Google search."
"General reference" was never implemented as a close reason network-wide, and for good reason. "Too simple" is not a reason to close questions. Yes, questions are better and more interesting if people have done prior research, but we are not turning people away for asking questions that are too basic. In the blog post you link to, Jeff says that he and Joel disagreed on this subject and that they were thinking of implementing "general reference" as a new close reason.
The new close reasons are about to go live everywhere on the network, and "general reference" is not among them. For sites that currently have it (which is, I believe, only two), they will incorporate it into their on- and off-topic policy (e.g., "Questions that can be answered by looking in a dictionary or thesaurus are off-topic here.")
If Stack Overflow as a whole decides that "simple" questions are not allowed, you need to start a separate meta post that provides very concrete parameters for what "too simple" means, and it needs to have community consensus. If that happens, it can then be incorporated into the moderator-editable "What topics can I ask about here?" page of the help center.
Keep in mind: Just because something can be answered by a Google search does not mean that it doesn't belong on SO or the rest of the SE network. Most people find us through Google. I agree wholeheartedly that people who ask questions should do some research before posting a question here, but I disagree that anything that can be found by Google is inherently inappropriate here. As long as the question is asked with proper grammar, is not a duplicate, and receives a good answer, it is making the internet a better place – which is our mission, after all.