It's unclear what's going on with Devin White. He's never been a great player despite the fact that he was the 5th overall pick in the 2019 draft and made the Pro Bowl. According to the Athletic, Fangio said that he won the starting job in Philly, but then he tweaked his ankle and he hasn't played a snap all season.
His contract may have something to do with this move. Apparently by releasing him now, the Eagles get out of paying him and White gets to go free without clearing waivers.
He's only 26 years old, but he's never been graded very highly by PFF. His reputation is that he's not good against the run.