These guys are correct, you can only receive the platinum reward from an offer one time. If you've completed this offer before, you will not be rewarded if you complete it again.
I completed this exact offer a couple weeks ago on my account and was correctly rewarded my platinum (though I had to send email proof in to verify >.>)
Remember that these offers and their confirmation are done through the offer providers, we don't control whether or not you receive your plat, so all issues have to be brought up with them
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