I have no idea and it is of no consequence, it is an example of keyword stuffing pure and simple. If NHSEO were able to get a site penalised I would have seen it happen on nohandsseo.com as that has been extensively promoted by my tool, I still have PR of 2 and all of my rankings and traffic.
I have used NHSEO on many of my websites and have not seen a single drop in rankings or traffic across the board (other than the usual fluctuations on the usual sites), in fact I have seen a slight increase across the board.
This update is about content, it is clearly stated in that blog and everything that has occurred since it would strongly suggest it is a content driven update and not about links.
I am not the only NHSEO users to post their experiences and have positive things to say since this update, others have had NHSEO running 24/7 direct on their websites for long times with no drop or some websites dropped and not others, if NHSEO was harming websites there should be a drop on all websites or at least most but this is just not the case.
Below is a bunch of screenshots I took yesterday to show that none of my websites have been impacted:
NHSEO traffic statsServer traffic stats (around 20 domains):A client websiteIf it was NHSEO that was causing these recent drops then there would be at least some dropp off in traffic on one of my domains. As google has stated and as all of the evidence will prove, this update is about content and the over-optimisation of on-site factors and not about NHSEO in any way.