They didn't announce that they would be accepting bitcoin payments, they announced that they PLANNED to accept bitcoin payments in about five months.   That was far from a sure thing and a lot could have gone wrong before then (including changing their mind).   

So it is significant "news" that a major retailer is actually taking bitcoin.  However the chart was already screwed up plus the recent bad news out of China and the mining bad news, so was too much to overcome.