This summary is not the rule. The rule text controls.
If someone pays for another person's medical bills after an accident, that payment can't be used in court as proof that they caused the accident. For example, if a driver offers to cover a pedestrian's hospital bill after hitting them, that offer can't later be used as evidence that the driver was at fault.
The idea behind this rule is to encourage people to help others after an accident without worrying that their kindness will be used against them in a lawsuit. If paying medical bills could be treated as an admission of guilt, people might avoid helping injured people out of fear of legal consequences. This rule removes that fear by keeping the payment itself out of the fault discussion.
It's worth noting that this rule only blocks the payment from being used to prove fault. Other statements made at the same time, like admitting "I wasn't watching the road," could still be used as evidence, since those are separate from the act of paying the bill.