[adament]

I had the same thought about the 200% thing. Actually I think it is either empty boasting or a difference of terminology. I understand giving 100% to mean: I give as much as I possible can. Giving 200%(or anything above 100%) sustainably for all your career sounds impossible by definition to me.

As an aside(since you used him for the author) I found it interesting that the author (according to her LinkedIn profile) is a woman. My initial prejudice was that giving so much more than everything to your work sounded like something that is only possible if you have a partner taking care of everything at home. And I immediately assumed this must be due to traditional family roles.