If your post was to point out a specific flaw, e.g., that the sample could have been pre- or post-contaminated, then it falls short of anything substantive and actionable. Nobody can do anything with it. Yes, you are correct. But no, there is not anything anyone can do with the critique. If you're going to point out a flaw, it needs to be something that you, the authors, or other PIs can check, perform, etc.