> As far as I'm aware, no existing facilities were added?
Nowhere in your linked article indicates that "no existing facilities were added".
> As of January 2022, the Pfizer-BioNTech COVID-19 vaccine is manufactured between 11 sites across five countries, including the U.S., Germany, Belgium, Ireland, and Croatia, and engages more than 20 suppliers.
https://www.pfizer.com/science/coronavirus/vaccine/manufactu...