[elmomle]

I believe the parent was trying to say that the information provided is anecdotal, and that they would prefer hard data. They were doing this in an exasperated tone--the full version of their expression would be some version of "If that isn't hard data, I don't know what is!", and is meant ironically in this context.

[rongopo]

Got it, thanks for the input! To the best of my knowledge there are no published results showing this comparison in quantitative terms