Yep that seems to be the case.
SnapVault is support in clustered OnTap8.2 and OSSV will be supported in 7 mode…
You may wish to confirm if snapprotect covers non netapp stored data in the way OSSV does.
Syncsort definitely does that, but is a very different solution and is really a backup solution that takes advantage of NetApp but doesn’t integrate with NetApp primary storage in the same way as the Snap software does.