Doctor, what's the point of saying that "the east wind doesn't follow, and the bronze sparrow terrace locks Er Qiao in spring"?

"Dongfeng is not with Zhou Lang, and Tongque Chunsuo Er Qiao." These last two familiar words mean that if Dongfeng hadn't helped Zhou Yu, Tongquetai would have locked Er Qiao in Dongwu. This involves the famous Battle of Red Cliffs in history. The poet is quite clear about this, because Du Mu himself has the ability to help the world through the country, is familiar with politics and military affairs, and is very familiar with history and current affairs. As we all know, both Battle of Red Cliffs and Wu Sheng were defeated by Cao Cao, but here the author made a bold assumption of reverse thinking and put forward a hypothesis that is contrary to historical facts. What would have happened if Dongfeng hadn't helped Zhou Yu? The poet did not speak frankly about the end of the war. But "Tongquetai locks Er Qiao in spring". Tongquetai is Cao Cao's luxurious and dissipated place, where concubines and geisha are kept. The bronze sparrow terrace here reminds people of Cao Cao's romantic side. It is said that "deep spring" has deepened this romantic charm. Finally, the word "lock" is used to further highlight the meaning of his golden house. It is really admirable to write so many stories about the victory and defeat of the war filled with smoke.