Look at the increases and decreases in hashing power. It began with around 9 TH on the 24th and then rose in increments divisible by 24.5 TH. There are no other mining units which would do this. The drops also occurred in multiples of 24.5 TH. Look critically at the charts I posted.

You can clearly see that the miners at this address are not stable for whatever reason - they are not end-user products shipped by another company and they do not belong to hashfast.