Hotfix -- that word does not mean what you think it means. A "hotfix" is a patch applied to a running system while it continues to function normally.
If I understand, then, the term "hotfix" is now used to refer to something that is simply an incremental patch to an existing release, and does not at all refer to the impact on users of the process of actually applying it, which, in this case, involves an outage of possibly several hours duration.
Well, I'd argue that would be a misuse of the original term, though I suppose that it looks better than "incremental patch."