Is this still a thing?

I’m not sure if I chose the right category for this but I do think this is a support question so here goes.
Is the information in the link still valid for adding legacy Tablo’s to a grandfathered account? I’m considering getting a refurbished Tablo Quad to add to it.

I have called to have them add devices to my “older” accounts. Now with expanded hours it should be even easier.

I recently bought another refurbished Tablo and filed a support ticket to have it added to my grandfathered account. They took care of that for me fairly quickly.