This article is disingenuous. Facebook is putting related sponsored content next to a 'like' in the feed and it is labeled as such. The complaint here boils down to that an unsophisticated viewer might think that sponsored content was what was originally liked when it was actually not. They say this is "impersonating a user". That seems way over the top.
You're facts are correct and this isn't officially "impersonating a user." However, there is a very fine line that Facebook is crossing. Specifically, these sponsored posts are displayed in a way that causes confusion to the viewing user and, I am confident, this confusion is intentional on Facebook's part. As an apt web user with quite a bit of experience with Facebook and the web in general, I still get confused by…
How can you be so confident about someone's intent?
I disagree with your assessment but didn't downvote your comment because I want to understand.