Penguin 4.0 is targeting single pages not entire site

[ksmith29]

Yeah, its a bit single page devaluing. Just found this post.
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Here in this page it is specifically stated.

Granular – The second significant change to Penguin is that Google announced the penalty will not affect the whole site. It is not clear what this means yet, but it’s likely that certain pages or directories will be hit with penalties. For example, if you have been buying links with the term ‘blue shoes’ or pointing links to the ‘blue shoes’ directory, then any ‘blue shoe’ pages would be penalised by Google. However, your ‘brown shoes’ directory and pages would be safe from Google’s penalties.