Bullshit. The USSR was a house of cards by then end. If it was doing at all well, it would still exist. It same as you stopping all maintenance on your house, car, not buying any cloth for years. Ya you can live well for some time but eventually your car breaks, your house starts to leak and you look like shit.
The USSR may have been able to survive a few more years but the longer they tried that model, the worse off each person would have been and the more unstable they would have become.