Looks like I can still edit the title. Care to make a suggestion how to phrase it?
should work; it's easy to infer that "after a year" refers to their hospitalisation anyway. If that is still too long: "Less than 20% hospitalised COVID patients symptom free after a year"
And dropping the "after recovery" goes astray from the central point of the article. That we are mistaken when we think that people have recovered.