Through college excludes Caleb Williams. I thought it excluded Lamar Jackson too when I typed that, but misremembered as he's just over. He is just over due to one nightmare year and two okay years at around 17% though - his median year is below 20%. I'd happily rephrase it to median college year though as this is about the guys who just consistently get caught, not guys who spike bad.
You're right it doesn't exclude Jayden Daniels, and I'd have absolutely not picked him. Between his Pressure to Sack *and* being an older guy with only good season, he screams bust city. He could be amazing like Burrow but odds are not in his favour. Yeah, people succeed with those two things, but the misses outweigh the hits.
Finally, I think the importance of extending plays is part of what makes pressure to sack so important. Can't extend a play you get sacked on! Sure, extending plays involves risk, but by and large good players mitigate those risks. But also, when it comes to kids coming from the NCAA, I just look at it as the best diagnostic for processing publicly available. Infallible? Hell no. But someone should be able to tell you why it's wrong in this particular instance. You can make a case that Daniels capacity for big time throws under pressure means he can process and he'll claw back all the sacks he takes and be worth it, like Burrow. I don't particularly believe it but you can make it.
If there's a case for that 'Bama QB, I'm all ears. But my guess is if he does things so well you can ignore a 30% pressure to sack, he's not there at 20 anyway. Not unless NFL talent evaluators get a lot less optimistic about training QBs overnight.