It was said IMO to calm the fears of the people, who will line up by the thousands to get it, and will demand it be available as soon as it's ready.
Fake and/or inaccurate news trying to hurt Trump which hurts the country 😡.
I think you raised a good point in that the media by now has managed to scare the bejeebers out of a number of people who are now too afraid to return to work without a vaccine.
From that standpoint Trump has every incentive to deliver one.
Even if it’s a placebo.