Contrary to traditional practices, new studies suggest flushing is not necessary and does not cause any change in taste, terpene profile, or smoke. In fact, the study I will link found testers actually preferred buds from unflushed plants vs flushed plants: https://www.rxgreentechnologies.com/rxgt_trials/flushing-trial/
With autos I have heard it’s best to continue nutes all the way through as it lets them continue to pack on weight until chop day. I personally haven’t grown enough plants to tell you a definitive difference between flushed and non flushed. It might have to do with the type of nutrients but the study I linked didn’t find any reason to do it