Thank you for people who have PMd me, very helpfully. For anyone looking at this thread at a later date, the issue affects all Gen 2 Audi R8s and, of course, the Performante which have sensors Huracans previously didn't have. As with annoying things like the Performante having different wheel bolts to other Huracans, you could say the Performante is effectively a 'facelift' car with a number of detail changes.

In short, if you get a Performante lowered you MUST get modified brackets for the air lift sensors to stop them going crazy when they notice a lower ride height. Otherwise your lift won't work, which is obviously exactly what you don't need when you've slammed your Perf