Not true — Although “squishy” suspension is not the best set up --if this is a first time out --do not worry about it. You will be spending most of your time trying to find the line, exploring how to brake and turn --and looking for the flag stations. ( and having fun)
I have been flogging an old 318ti the past two events and although I wish I had better suspension --or the 240 right now, it is still a lot of fun. Just make sure the car is safe.
Better to start in a slow , reliable car than worry about maxing out the suspension or engine. These are drivers schools – although Jesse has a full blown race car -( and will be running in a higher group than you) —many/most of the cars there are street cars.