Did you read these:
1)The article title...
Leading analytics team makes case for Cowboys letting Prescott walk
2) "But they might be able to plug one of the refined rookie quarterback prospects such as Zach Wilson or Mac Jones into their offense and experience similar short-term success. That shift would dramatically lower the team’s floor for the 2020s, but it would also raise its ceiling. Already up against the salary cap, an expensive Prescott extension would accelerate the hemorrhaging of blue-chip free agents that started with Byron Jones last year. By resetting with a rookie quarterback, the Cowboys could retain their other stars and build like the Rams and Eagles from recent seasons, teams that leveraged the cost savings of Jared Goff’s and Carson Wentz’s inexpensive rookie deals into exceptional roster depth and eventual Super Bowl berths."
You are reading the opinion of the author, not that of the analytics team. When you say "their end conclusion", their is the analytics team. That team concludes moving on raises the teams ceiling. The author's opinion has no bearing on what the analytics team's conclusion is.