So would Ford. Why do you think they BOUGHT the 675 and 458 Speciale in first place? To sandbag and make themselves "feel good" about how competition "looks slower" than their product?
Of course they ran those cars as hard as they could during their testing. Whether they published genuine laptimes or not - I think it would be pretty sad if they artifically added time to competition laptimes just for a better press release.
Maybe I am naive.
Just a little. They probably did run them hard, but that doesn't mean the times they published are legit times from when they were running them hard.