Charles’s death true or false?

Yes, that’s true. 

 “I didn’t say that there would be no coronation of Charles, I said that he would die in 2024. The last of the reigning monarchs is Elizabeth 2. Charles will reign for only a year at most. The real monarchy died after the death of the queen.” 

The factual death of King Charles will be in 2024, then a fake may rule and the death may be announced later. After Charles there will be no monarch, William will not become king.