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.
Whether you arrived at Windows 10 through a dedicated upgrade or ... allows you to download the Home or Pro versions of Windows 10, and you can pick from the 32-bit or 64-bit version for both.