why boot camp not support on this's MacBook ?

Boot Camp is only supported on Mac using the Intel processor. If you have a Mac with the M1 or M2 processor (Apple Silicon), you can't use Boot Camp.

The alternative would be to use a virtualization software like Parallels that lets you install Windows 11 ARM. Note that this version of Windows is not as compatible as the version for Intel machines.

If there was a Boot Camp for Apple-Silicon-based Macs, you'd only be able to install ARM-based OSses, not Intel-based ones.