The list author says: "This kit is based on having a minimal amount of gear, because having too much on you can become a hindrance. Plus, it would be ideal to become very skilled at fast and precise shooting in all kinds of environments. Many places will have low light and nowhere to place a tripod without sweating about stability.
Also, the lenses listed here are relatively cheap. In case you drop one, it shouldn't be too painful to replace.
Finally, this list isn't quite complete - come visit again later!"