Cardiomyopathy-Allessi

In Alessi’s article, or replies to questions he answered a question by a guy with cardiomyopathy. My friend also has this condition and I would like to lift with him, but he was under the impression that he couldn’t. Alessi suggested eccentric only type lifts, but I would have trouble writing a full workout like this. Does anyone have any idea about this, and if this truly would be safe for his heart?