Whoever wrote this made it sound like the adjustment period is suddenly 1960 blocks instead of 2016 because of the increased hashrate.
I read that three times before realizing that he counter the block remaining while he was writing the article, which is pretty useless if you raed it one day later.
That's the problem with calculating daily hasharte, it's such a random interval and it depends a lot at which hour your day starts, because there is a different between the number of blocks mined on the 12th when you compare Pacific Time and CET!
Because of that the actual highest is 649EH/s and it happened on February 3rd, if you consider GMT time.
Also called mandatory coloscopy day for all miners