You'd be forcing the engine to do the same amount of work at a lower power output and reducing the airflow over the cooling fins at the same time.
However, that's not going to matter in this case because you're assuming the electric PTO is larger than the mechanical one, and after looking at the parts lookup, I think that's a wrong assumption. The 1715 has a 3.5" trans drive pulley, and a 3.5" PTO clutch pulley. The 1015 has a combination drive/deck pulley that is two pulleys stacked, and the deck drive pulley is much larger than the trans drive pulley. I can't imagine the trans drive pulley would be smaller on that model because it wouldn't be able to transmit the engine's power very well if it were much smaller. So based on this, the sticker probably says what it does because the deck will turn too slowly on a tractor with the smaller electric PTO clutch pulley. So in reality, your combination will turn too slowly unless you replace either the PTO clutch pulley or the drive pulley on the deck.
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