As far as I can work out, the old light is that if you practised vile things you would get a resurrection, as long as you weren't sinning against the Holy Spirit. Once you were resurrected, if you practised vile things then it would prove that you had been resurrected to a one of judgement. A resurrected could practice vile things but only for a short time, a number of years, maybe less than 100 years.
With this new light, no one will be allowed to practice vile things during or after the 1,000 years. How sinful people aren't able to physically sin is a mighty feat but they want to create the 1,000 years as being peaceful and like paradise. You can't have people going around doing vile things and call that paradise.