Would have lived if he had a roommate. Do universities do single dorms now
Similar for Sam's girlfriend Kayla. If she'd been assertive and physically present, she might have saved his life.
Similar any close friend of Sam's.
Similar a bottom-tier resident staff member in Sam's dorm, worried about one of his residents and regularly checking.
(Yes, the U's dorm system "could" officially try to keep an eye on sick residents. But with America's legal system, don't expect any sane university official to sign off on doing that.)
Compared to an in-person check, or a video call, or even just a voice call - txt messages convey almost nothing about a person's medical condition.