In fact, this statement is unfounded, because in the Qing Dynasty, the emperor prepared two imperial edicts, one in Chinese and the other in Manchu. In the previous statement, Yongzheng only changed the imperial edict written in Chinese, so it is impossible to be an emperor properly, which shows that this statement is speculation. In fact, Yongzheng's throne did not come from usurping the throne, but Kangxi personally selected him as his successor.
When Kangxi was in power, he ruled the country with tolerance, which led to the corruption of officials in his later years. At first, Kangxi really felt that Yongzheng was too ruthless and attacked Yongzheng everywhere. Later, he didn't think so. Only a strict system can make the country strong, and he began to appreciate Yongzheng. Only Yongzheng can get the Qing Dynasty out of the predicament and let the people live and work in peace and contentment.
Kangxi passed the throne to Yongzheng for another reason. Kangxi was very fond of Aisingiorro Li Hong, the son of Yongzheng. He thought that his grandson would make the Great Qing Dynasty rich and strong in the future, and Aisingiorro Li Hong was the later emperor Qianlong. From this point of view, Kangxi's insight had to be admirable, because later Yongzheng and Qianlong created the "anti-dry Shi Sheng". Therefore, Yongzheng was able to become emperor not by usurping the throne, but by his own strength.