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.
Windows 11/10 Home 64-bit supports up to 128 GB of RAM, while Windows 11/10 Pro, Education and Enterprise 64-bit support up to 2 TBs of RAM, Pro for Workstation can use up to 6 TBs. The 32-bit ...