The thing is, none of this really matters in the end, particularly for the Huracán. Let us explain.
For one thing, if you're going to question the Performante's time, you should question all of the times. All of these records are presented by the manufacturers, so there isn't a truly impartial party measuring the results and inspecting cars. Even with a company presenting plenty of data and explanations, it's hard to be 100 percent sure everything is on the level without an unbiased third party inspecting the cars before and after the lap, and keeping timing.
But besides the issue of impartiality, the times themselves aren't really important. As interesting and fun as it is to compare lap times at the Nürburgring, they're really only relevant for rich owners and car companies to brag, and for less-rich fans to bench race. That's not a bad thing, but to look at the lap time of one single track doesn't really give a full picture of a car's performance. A car that's fast at the Nürburgring could be really slow on a tight course like Streets of Willow Springs. There's also the issue of who's driving the car. The manufacturers put their top drivers out on the 'Ring to set times. If you're not a factory test driver, you'll probably never go that fast even if you did get your car to the track. It's all a bit like the silly "blind" or two-wheeled car records. They don't actually provide much info on what the car is really like, or how you could drive it.
Even if you're not on board with this explanation, and trust all the 'Ring records except this Lamborghini, we still have a reason why it doesn't matter. You see, even if you're convinced that there's no way the Huracán could best the Porsche 918 Spyder and the Aventador around the Nordschleife, it's still a screaming supercar bargain. The Porsche is a million-dollar car, and the Aventador, just the base model, is $125,000 more than the Huracán Performante. A healthy skepticism about the validity of the Performante's lap (or lap times in general) won't diminish how impressive that is.