I started my career at SAP. Although I feel like I'm behind the "startup curve" because I spent 4 years there, the lessons I learned about managing teams and understanding complexities in a large company are absolutely priceless. I don't believe it was a mistake whatsoever. You and I are probably being too pedantic, but I agree, it was a poor choice of words.
Lately, I've noticed a meme from investors about discerning founders who can start companies and those that can grow beyond 250+ employees. The generally consensus is that there are very few entrepreneurs (Zuck for example being one of them) who possess the capability to scale. I'm not talking about scaling servers, I'm talking about scaling organizations as quickly as their revenues grow. Looking at it through the lens of an external person, this may seem trivial at first, but having been in the professional world for 8+ years now, there are some key challenges all companies hit when they hit certain growth (for example, hitting 50 and 250 employee milestones). Working for a big company can (notice I didn't say will) prepare you for that.