I would love to say yes, but I need to elaborate a bit. Yes, excess protein, particularly the BCAAs, may do more harm than good. And, yes, sufficient exercise is good compensation. Not only for excess protein but also for other "slip-ups", like too little sleep or the occasional overindulgence in wine etc.

But as I explained in another response to a comment of reader "Every Day Life Improvement", the human organism has an ingenious way of dealing with protein excess. One of these ways is to increase the recycling of cellular proteins by upregulating the rates of degradation and synthesis. These energy-costly processes prevent the excess protein from being converted 1:1 to excess fat and glucos/glycogen. A healthy organism can deal well with protein excesses (to an extent, of course). But once these aforementioned processes of de novo lipogenesis/glucogenesis are (production of fat and glucose from protein precursors) derailed protein excess becomes a threat. These derailments we see most frequently in obesity and type 2 diabetes. The consequences are then an increased risk in NAFLD (non-alcoholic fatty liver disease) and cardiovascular disease generally.