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No, that article is the April 2012 Penguin article. You can see that Search Engine Land linked directly to that post here when confirming that Penguin was live.

The only examples of on-page text that Google published for the Penguin algorithm can be found here. They include obvious keyword stuffing and irrelevant link anchor text embedded in page copy, but...

I would trust your gut instinct before I would trust any online tools. You know what you have been doing with your backlinks. If you didn't violate search engine guidelines and you don't see a lot...