Not increasing difficulty in 12 months, but forced and guaranteed increase to such a high amount. This is the timebomb feature to force ETH to hardfork within 12 months, or else nothing can ever be mined with the difficulty.
People say this will mean a more robust ETH but I don't know because for me hardforks are always unstable times for a network. Miners will be leaving ETH I guess which means slower growth and slow security growth. But investors will love it.