I wouldn't hold my breath on his comeback, but you can hope, pray or both. Depends on the severity of the effects. I've seen massive strokes "fixed" in hospitals with clot-busting drugs and folks who were completely paralyzed on one side come out with zero side effects. On the other hand, I've seen young people with debilitating strokes that leave a lifetime of measurable defects, whether large-scale or small. Strokes can be caused by blood clots (ischemic) or by bleeding in the brain (hemorrhagic.) Ischemic strokes are far more common (85% of all strokes), and once it's determined to be ischemic (CT scan shows no bleeding in the brain) then they usually have a good shot at administering a "clot buster" like tpa.
Hemorrhagic strokes (bleeding in the brain) can be caused by a huge increase in blood pressure, a ruptured blood vessel, or by an aneurysm in the brain. The American Stroke Association says that between 1 and 5 percent of all of us might have a brain aneurysm, despite never having any symptoms. It also says that heavy lifting could cause cerebral pressure to rise and possible rupture of an aneurysm, if one exists. Blood pressure often rises to crazy levels during heavy lifts (systolic blood pressures of well over 300.) .