This is a fun exercise, then ask the second question "How productive can I be in my job when the network is unavailable?"
The author states : What I’m trying to show with all this is that you can do something 100 times but still not remember how to do it off the top of your head.
My experience differs from this, if I were to rewrite it I would say something like:
"You can do something 100 times, and as long as you can look it up somewhere, it is okay to not memorize how to do it."
You have to evaluate the impact on your flow of stopping to look something up, you have to evaluate what you consider your 'base' skill set is to evaluate if you should memorize something.
Before Google, the canonical case here was arithmetic. Who needs to memorize multiplication tables if you have a calculator handy to do simple arithmetic. Basically if you cannot do basic arithmetic in your head, you are always going to be at a disadvantage with respect to someone who can.[1]
I have found a reasonable compromise, when I Google something like this, I write down the solution in an Evernote notebook that I keep for such things. So if the same question comes up I can always find the answer and don't have to have either the web page or Google around to get to the answer.
[1] And as a "magic trick" you can hand a cashier what appears to them to be an odd amount of money, only to have them discover when they enter it into their register the change is a minimal number of coins/bills.