First of all, I applaud the attempt to use a comparative analysis to try and prove BB a bad drafter. Obviously cherry picking the last 6 years shows that's the intent; as going back even one more year let alone 10 ruins the argument.
So the years in question are 2014, 2015, 2016, 2017, 2018, and 2019. It's kind of early to be judging the latest three drafts, which is why the PatsPulpit article says it didn't include them.
Looking at the three years that do overlap in the two studies, 2014, 2015, and 2016, I note that the Pats had a slightly above average year in 2014, and the 2nd best year in the league for both 2015 and 2016 (the Bengals had one slightly above average year, one slightly below average year, and one stinker). In fact, by the PatsPulpit analysis, 2016 was the best year the Pats had in the 20 years graded, and 2015 was the 3rd best. And 2016 is rated the 5th best draft by any team in the last 20 years!
So what accounts for the disparity; how could the Pats have very good drafts yet not produce any ProBowlers?
Well, one big difference is the PatPulpit analysis weights by draft position, i.e. the Pats are graded higher because their pickling position(s) have been consistently lower. The Pats had the 29th pick in 2014, the 32nd pick in 2015, and no first round picks in 2016 or 2017.
One hypothesis -- which is testable -- is that it's difficult to draft ProBowlers if you only have very low 1st round picks, and the Patriots run the last 6 years probably involved historically low opportunities to pick in the 1st round.
But to reiterate, the PatsPulpit weighted analysis in the years that overlap indicate the Pats drafted very well indeed in those years.
Nice try, though.
The Patriots are better at drafting than you may think - Pats Pulpit