That doesn't matter they need the vaccine anyway because they are not sure how long the antibodies last; for that matter they are not really sure how long the vaccine will last will it require a booster every year? every 2? who knows
Yes we still need to get vaccine but if there are people out there with antibodies we can't track we might need only 50% vaccinated right away instead of 70% to get these numbers low as possible. I could be optimistic about it but we'll only know as we move forward.