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Re:On the Security of RC4 in TLS and WPA – Full Paper Released by mindslight on Monday July 08, 2013 @05:08PM (#6009299)
The sentence immediately preceding what you quoted is necessary for understanding:

> Suppose byte Zr of the RC4 keystream has a dominant bias towards value 0x00.

Re:On the Security of RC4 in TLS and WPA – Full Paper Released by tptacek on Monday July 08, 2013 @05:16PM (#6009364)
It's necessary to understand why the attack works, but not so much for understanding how to implement it. But you're right.