Obfuscation means concealment . In programming it is used for source code protection, for example. You can read more about obfuscation in the internet, f.e. here: http://www.9rays.net/Category/55-spicesnet-obfuscator.aspx
It means, avoid being confusing or unclear. The statement "eschew obfuscation" which many people (due to a limited vocabulary) would find confusing and unclear, is intended ironically.
Obfuscation of source code is the practice of formatting the code to be difficult to understand. It also makes it difficult to support. Since source code development and support is a team effort, I...