Yes but it’s a presumption rather than something that is proven.

If the guy who done it was blonde, 6’2”, driving a red Mercedes, and he wrapped the body in a green rug, and it turns out that the bloodstains on green rug of the 6’2” blonde guy with the red Mercedes that you arrested for it are only actually 70% likely to be the victim’s rather than 99.5%, while LEGALLY the guy in prison now can benefit from the presumption of innocence, I’m not sure I’d be comfortable if he moved in downstairs.

Proven innocence would be “oh we have irrefutable video evidence that this guy was two states away at the time”.