The thing is, traditional passer rating only accounts for pass accuracy, interceptions and touchdowns. It doesn't take into account, for example, that CJ Stroud had 5 fumbles. Or that Matt Stafford went through a large stretch of game where he had 12 incompletions and interception and a near 2nd dropped interception before he started moving the ball when we went semi-prevent. It also doesn't account for runs and running touchdowns.
In addition, things like time-to-throw are difficult to measure. A QB running for his life is gonna higher TTT stat because he's maybe rolling out the pocket, or escaping a pressure. If you watched Herbert on Sunday, a lot of people would say his line was a turnstile, but he had the highest time to throw.
QBR does take a lot of that into account, so the Total QBR vs the Passer Rating is never gonna match up exactly.
This forum is largely anti-Bryce though, so if his passer rating for 101.5 because he threw 3 TDs and had 1 int, but had 5 fumbles, people would point at the low QBR and say... SEE! I told you, passer rating doesn't tell the story!!