This could explain why hashrate is coming down overall according to bitcoinwisdom... Quite unexpected, but there's probably going to be another farm built soon. Difficulty will drop a little and go back up.
the chart on blockchain don't show any drop in the diff, there must be a very small farm there when they shut down, will not put any dent on the diff, and besides other faarm will keep adding machine
the diff at this point will never go down, unless antpool shut down his farm or whatever, also with the two weeks adjustment, you can't probably notice it, if they can setup again new machine in two weeks