Not at all, thing is realistically it's quite dangerous to do what we'll attempt in the barrel tunnel it's not like it can't be done, it's just the cost of something of that magnitude and the recklessness of it all. Physics dictates that enough downforce and forward momentum you can by the numbers drive inverted. Real life = expense and death if you are off by a hair, don't assume because it hasn't be done it's not actually possible. Simulators purpose is to test things that in real life would be a massive cost just to test and fail, so they simulate until it's at a point where it's physically testable without incurring massive costs testing it's reliability. This is what simulators are made for, GT should have always had things like this in it, it's about time. Concept cars, one offs, cars that PD build with no real world counterpart, but definitely can be done IRL. I say more games should have this in it, it's a great thing. The Redbull fan car is definitely something that can be built and raced, but at sea level those G's would require special tires to be built to withstand the G-Forces during cornering, remember the Chapparal 2J(fan car). You should be happy and welcoming of the ability to try out things that would be otherwise prohibitively expensive this side of reality.