Does anyone know how the data actually well, is detected? If the car aquaplanes then the tires are effectively off the surface and the rpm would shoot through the roof. He was relatively slow early in the corner, could the apparent increase simply be the car losing traction and the tires spinning up significantly. I was also wondering if that section was downhill or not, because he could also aquaplane and essentially accelerate downhill to some degree at that point.
Either way, on corners that are known to be the first or worst places for aquaplaning any kind of extra vehicle should not be allowed on track without safety car. I'm not saying they had to have a safety car, just that Sutil's car alone would be a LOT less dangerous than a 6.5T truck of any kind.
They could have put out a more significant warning and as discussed things like a speed limit to prevent cars losing out to each other would reduce the risk many times over.
In the dry on any given corner someone goes up making a mistake themselves, with aquaplaning, particularly in changing conditions, the track can be safe one lap and dangerous at half the speed the next lap, a driver can go off without warning without driving unsafely and without being at fault. So at lets say Silverstone in dry conditions one car going off at one corner doesn't increase the chances another car will go off at the same place.
In the wet that isn't true, if one car went off because of aquaplaning there is a significantly increased chance that another car will go off in the same place within the next few laps, aquaplaning in worsening conditions often catches more than one driver out.
This is obvious, it's known, it's happened in LOADS of wet races.... putting a 6.5t truck out there when you have a statistically significant chance of another car going off on the same corner is literally insane. It's negligent, if Bianchi died, you might wonder if it was criminally negligent.... I think it might be.