I think you are looking at old data. And, of course, other governments were looking at the US for decisions.
The latest report:
A new scientific review suggests that widespread masking may have done little to nothing to curb the transmission of COVID-19.
nypost.com
The stance by the Centers for Disease and Control Prevention (CDC) on face masks has taken many twists and turns throughout the COVID pandemic.
spacecoastdaily.com
Your Mayo Clinic report states " Can face masks help slow the spread of the virus that causes coronavirus disease 2019 (COVID-19)? Yes. Face masks combined with other preventive measures, such as getting vaccinated, frequent hand-washing and physical distancing, can help slow the spread of the virus that causes COVID-19."
So, which one really helped. Was it vaccination? Frequent hand-washing? Physical distancing? Masks? Did they do a specialized review with mask only?
Notice the ups and downs remain consistent win 2021 - I can't upload the picture:
This report describes overall death rates in 2021 as well as COVID-19 death rates. COVID-19 was the third leading cause of death in 2021 after heart disease and cancer.
www.cdc.gov
It didn't matter that we closed businesses, added vaccinations or used masks... it still went up and down and up and down. IF they worked, there would be a steady downward slope when efforts were in effect.
The China issue is simple... if they lied about China, where else did they lie?