The original document that is misquoted and misrepresented in this article points out several reasons why these unadjusted numbers should not be used to gauge vaccine efficiency:

• testing behavior between the two populations differs and is not considered in these numbers
• those most likely to be vaccinated are also in groups at highest risk for contracting covid in the first place
• unvaccinated individuals are more likely to have already had covid once and so their case rates may be lower (finally acknowledging acquired immunity)
• vaccinated individuals are more likely to participate in social settings that have higher risk of contracting covid

I'm fine with taking a new look at data but this article wilfully omits key findings that make it look very misleading.