No. Io_uring is a message passing system where you tell the kernel to do something and let you know when it's done.

Syscall chaining refers to having the kernel execute consecutive systemcalls without switching the context back to userspace.

An example of this might be closing a multitude of file descriptors or registering signals or writing the same data to multiple fds etc, which becomes prohibitely expensive if you need to do it multiple times quickly, and actually doing it even once is really expensive if your sets are large.