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In general, I do not think flagged posts get removed (I have access to multiple such posts). But they probably are not listed in the search indices, only available with a direct link (e.g. from your comment history if you commented there).
If you are past a modest karma speedbump, anyone can hit flag. It right next to the upvote button.

Those articles are not [dead] but the algorithm penalizes them when ranking the front page.

I didn't comment.