That's their search volume from the same time period, doesn't look like too much of a Google hit.
If they got slammed that hard, the search percentage graph would be skewed more to other sources of traffic.
Either they lost traffic overall, or other sites (in all genres) are just ranking higher on Alexa. Also Alexa doesn't only count unique visitors for their ranking, at least last time I checked.
Here's our traffic from Google and Bing over the years (I know it's small):
In all honestly in 2014, you really shouldn't count on traffic from search engines. Focus on something you can control, like social media.
Search engine traffic is nice, but it can go away anytime, for any reason...
That being said... I still follow Google's Page Speed guidelines like the Bible :P