Prigozhin isn't stupid - I doubt he would have stopped without a good reason. They would have taken moscow if they went for it. My personal theory is that there was a palace revolution that we're not privvy to.
Nothing about this, with the information that we have makes sense tbh. Only reason he'd stop is if he was certain he wouldn't have been suicided. That certainly indicates a shift of power in Kremlin but as to what actually happened we can only speculate. I think it's telling we didn't hear Putin have an adress yet.
What if the coup was actually successful and there will be a power transfer? Nobody half asses a coup and lives to tell the tale