Can someone get better from congestive heart failure?
One can "recover" and "get better" in terms of lifestyle but the physical damage may never be completely repaired.
The BEST "cure" is prevention by lifestyle changes before it happens!
Making those changes after a heart failure may improve the heart somewhat and future avoidance much more. BUT, if a heart failure occurs first, there really is likely permanent damage to the heart muscles that can be mitigated, but never restored.
So, when doctors talk about "getting better" after congestive heart failure, they mean that dietary and exercise changes can help to prevent a future failure by strengthening the heart muscles and reducing the stress put on it by other body factors.
Those changes MAY actually make the person feel better than they did before the heart attack. But then, why wait? Live that way NOW!