Might have been tongue in cheek. Old Tele Man is known to do that occasionally
Millions of cars have been sold over the last decade with LRR tires. (Think of all those hybrids, and "3L" / eco variant diesel cars in Europe.) While there's no doubt the grip offered by different tires varies, if there were a statistically significant increase in the crash / death rate of that category of cars, we'd know about it.