Umm actually this is NOT gold OA-Publishing. In gold OA, we (or our institution) pay for our article to be made open so that access can be free of charge for everyone, and not for the unconditional acceptance of our papers or for skipping the peer review.
I advise to the person in question to ask for the peer reviews. It will be obvious from the text if they have been written by qualified and competent peers or not.
