What's the information about Han Xin's plan of flying daggers?

The three films you mentioned are not so-called flying daggers, they are all composed of storytelling. As long as the old man shows that Xiang Yu is unpopular, it is simply a trick of Sean (of course, it is not recorded in the official history).

There is no such thing as flying knives. House of Flying Daggers first appeared in unofficial history and Pipa in Yuan Dynasty.

If you are interested, you can listen to Farewell My Concubine by Mr. Yuan Kuocheng, and maybe you will have your answer.