He’s saying he’s proposed changing the game’s files so that there will be bookcases in hospitals that have a 60% chance of spawning various medical related books, including patient records.
If I’m doing the math right, each book case that spawns items has about a 3% chance of spawning patient records and there’s 4 bookcases per hospital. That’s still about twice the rate as a doctor’s office which has 3 possible locations and a 40% chance of spawning an item at each location with the same probability of getting the patient records.
Of course, an early survivor can usually run through a doctor’s office without much difficulty, while hospitals can be challenging even through midgame. And this is only a proposed change. Still, it’s an improvement and will go in sooner or later.