Having said that, I don't really think that you can say that with his "100% time" he can still achieve what Google employees once did during 20% time. My understanding is that Google now (and for a while) has not actually continued to uphold the 20% tradition - and that was expected with company growth - but back when it did, the idea was that you could spend 20% of your time to build your own side project using Google resources and while getting paid by Google. Maybe it would become super popular and be a 'real product' some day.
With "100% time" you certainly cannot legally do this. I can't go to work and devote some time to some side project using my company's resources and while getting paid to be doing other work. Sure, I could put in "100% time" into doing it, but it would be illegal.
Like I said, I like the message, but mentioning 20% time seems wrong since you can't compare the two. In my opinion, anyways.