False positive retraction?

I'm looking at the Zotero entry for https://doi.org/10.1016/j.hrthm.2016.05.028 which states that the article was retracted on 6/10/2016. However, the Zotero link to the retraction notice doesn't show any retraction. I'm trying to sort out whether this article was retracted (and Zotero's warning is accurate + the publisher is not displaying notice), or whether the warning is inaccurate. Any tips?
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