The article is talking about multiple possible uses for mRNA drugs, including prophylaxis and non-prophylaxis vaccines (you would not take a vaccine for a cance

The article is talking about multiple possible uses for mRNA drugs, including prophylaxis and non-prophylaxis vaccines (you would not take a vaccine for a cancer before you get it, unless it is to prevent an infection that could cause cancer (HepB, HPV, etc)), and mRNA therapeutics, including ones from protein replacement. For protein replacement, you would have to take the mRNA often, because mRNA degrades. Your immune system has memory, but you won't keep making random proteins after the mRNA goes away.