All it means is that the chair does not need to be determined. Does that mean I believe that Benedict is the pope? Of course not. All it means is that I'm choosing not to label myself as sedevacantist because I have the option of not doing so.
You can call yourself what you like, but it won't stop others from passing
their judgments upon you and proclaiming that you are a sedevacantist
even if you claim otherwise, because you deny B16 is the Pope. And you
can't stop them from doing that. I'll be surprised if it does NOT happen.
A lot will depend on how you take it when they do so.