No, what they're saying is that the notion that you can "drain" the system pool is an urban legend created by a bad Linux man page. In reality, entropy isn't really ever "drained" from the system entropy pool.
Actually, now I sort of wonder what would happen if you encrypted a quantum superposition so that to determine which branch was taken would require reversing an operation using, at the lower bound, more computation than is available in the universe. Would it hold, or collapse/decohere?