Yes, you need a valid support account to download NetApp ONTAP Storage OS and patches or any other NetApp products/applications/softwares. There is no 'separate' patches for Simulator Builds. There is only production ONTAP/patches for download (like the one you posted). Same Production Patches are also applicable to Simulator Builds, in other words you can patch the Simulator using the Production patches, and hence you need a valid support account.