I think there are two things people are reacting to here: 1- the study does appear to choose an arbitrary set of years with little explanation for why that time period was chosen, it seems reasonable for that to invite criticism; and 2- it's natural to have a negative reaction when someone call you or something you care about bad.
My 2 cents - it's pretty obvious we didn't draft well for a large chunk of those years. I believe the past 2 years have been a substantial improvement for us, especially in the later rounds, but really only time will tell. The 30 ranking does seem a bit harsh though when you consider the fact that we haven't consistently been picking in the top 3 or 4 every year and usually finish around 7-9/6-10 in that era. Pro Bowl rankings being apart of this metric are a bit worthless, the pro bowl is a joke and is slanted heavily towards larger market teams. I don't think we deserve to be ranked 30th, but even a homer like me admits anything above 25 is probably way too optimistic.