The /MediaArch x64 argument specifies that MCT downloads a 64-bit Windows 10 Enterprise edition – and in this case, v1909. If you need a 32-bit Windows version, change it to /MediaArch x86.
The command will output the Windows 11/10 OS architecture accordingly. Windows is available in both 32 and 64-bit architectures. What this basically means is the amount of memory your computer is ...