Does that mean Anthony Spencer never made it or what? Who drops out of the my made it list?
Spencer made the Pro Bowl in 2012. You need to add Felix Jones and Bobby Carpenter to the list of those who didn't make it. Ekuban and Carver should come off since those picks were more than 20 years ago.
I don't believe that Dallas only had 19 1st round picks in the last 20 years. They had none in 2019 (Coop trade) and 2004 (traded out of 22 to allow the Bills to take JP Losman so first pick was Julius Jones in round 2) but two in 2005 (Ware and Spears) and 2008 (Felix Jones and Mike Jenkins), so 20 in total: 15 made the Pro Bowl at some point; 5 didn't (according to your list, which seems largely correct, though I haven't double-checked).
In one way this is even more impressive than Eatman suggests (75% hit rate, instead of 70%). It is misleading, however, to compare our hit rate over 20 years to the league average over the past five years, given that the longer time frame affords guys that many more chances at making a Pro Bowl.