You came in starting with scare quotes around the word "study," and then didn't share any prior research you had done into trying to find the methodology or efforts you had made to request such information.
You also didn't weigh in with any thoughts on the data itself, or make it clear that you were hoping other people had the report and would actually be able to present you with the methodology used. Given that you knew it wasn't publicly available information, this would be important to share and would lend significant weight to why you were concerned about it.
I agree that it makes sense to ask about the methodology of a study, because it doesn't always make sense to take something at face value. Statistics can easily be used to paint whatever picture you want, and without knowing the true intentions and inner workings of the research, you can't judge if it is accurate or impartial.
However, if we agree on this much, why would you expect people to take your post at face value without you illuminating your reasonings and steps taken at the start, especially when your post is a counter to the validity of having the thread in the first place?
If your position was nigh indistinguishable from concern trolling without seeing this underlying information, then by the same token by which you question the study and if it has a hidden agenda - and asking for methodology is a correct form of questioning - you should be able to step back and see the value of why you might want to apply this same concept to a post you're making.