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by BorisMelnik 4170 days ago
there are many different types of Google penalties. It doesn't have to be a complete loss of traffic. Sometimes you get bounced back 1 page, other times 3, other times 99 it varies based on the 'offense.'

You are correct in stating this was only a slight drop in impressions. In this case I would say this is Googles fuck up. The algorithm is not mature or smart enough to see that the blog was moved.