Hi,
I also checked the documentation and matrix site, but there isn't any word on 'vCenter-HA'. It does talk about VSC in multi-vCenter environment but that's not true HA, it is one-2-one mapping between VSC and vCenter server.
I think unless you hear any official word on this forum thread, best advise would be to raise a ticket that way you will get an official word from NetApp and would help others as well.
Thanks!