No, although this was true until around 2019 when Linux introduced io_uring and finally had a genuine innovation. io_uring wound up giving us a unified asynchronous I/O layer that handles just tons of things. (And it is genuinely a step up from the overlapped I/O APIs of Windows, as it avoids eating syscall transition overhead in many cases.)

Of course, Microsoft then went on to introduce IORing in 2022, continuing their legacy of never being afraid to adopt good ideas. But still - it would be wrong to suggest Linux is currently behind on async I/O. It hasn't been for years.