The publication you linked (https://publichealthpolicyjournal.com) is not the official Journal of Public Health Policy.
This website appears to be a different journal with a similar name.
This journal is not widely recognized in the scientific community and has unclear peer-review standards.
The study was “peer-reviewed” by Peter McCullough, who is known for spreading inaccurate medical information.
The methodology of the study has been criticized for serious flaws and bias.