If a vaccine is something that keeps healthy people from getting sick when they are exposed to a virus or bacteria, then it would qualify.

"Eventually, healthy people might be able to self-administer the mini-binders as a nasal spray, and potentially keep any inbound coronavirus particles at bay."

But it sounds like something that you would have to repeat any time you think you might have been exposed to the virus, not something that you take once and after that your body either has antibodies or knows how to make them.