E9 Pro does not support zil mining, period. The miner is technologically incapable of switching to epoch 0 to generate the ZIL DAG file, and Bitmain has confirmed this exact matter, specifically stating that there is "no support for other coins or fallback to previous blocks mining, Epoch support will be updated with block update (meaning ZIL will be supported when the block number reaches epoch 1 in September), and no support for previous Epochs (epoch 0)."

Flexpool's fake ETC ZIL mining not only is less profitable than straight ETHW mining (as confirmed by Pugs), but is a complete hustle to try to get Bitmain users on the pool before epoch 1 begins. They take a small loss on the ZIL side of things but subsidize the loss with their ETC revenue gained and massive hidden fees.