Vaccines are never treatments
Actually there are some therapeutic vaccines that work after disease onset.
But, yes, you are generally correct.
“Vaccines are never treatments”
Vaccines are not vaccines.
Vaccines function by preventing disease-causing infection.
The mRNA injections famously do not prevent disease-causing infection.
The mRNA injections are not vaccines.
Therapeutics (treatments) function by getting infections under control, reducing major symptoms over time, and helping the bidy ultimately defeat infections, returning the patients to health.
The mRNA injections are said to be effective in keeping those who are infected with COVID-19 out of the hospital and protecting them from dying.
The mRNA injections are (prophylactic) treatments.