I followed the guide and had zero errors, no issues whatsoever, it was really easy. No excuse, really.This is no different than the people who brick doing the 9.2 downgrade. For the OP, they will need to take yet another downgrade risk and is really lucky 10.8 is not out yet or CFW would have been out of reach if downgrading is patched.
Also most bricks doing the A9LH guide are from people who did not follow the guide correctly. Some are from the random risk of doing any kind of downgrade however.