They put COVID 19 last in the example because they set the example of assuming it is the underlying cause
Instructions
Do not enter terminal events without showing etiology
Enter the underlying cause last
https://www.cdc.gov/nchs/data/nvss/coronavirus/Alert-1-Guidance-for-Certifying-Covid-19-Deaths.pdf
It is important to emphasize that Coronavirus Disease 2019 or COVID-19 should be reported on the death certificate
for all decedents where the disease caused or is assumed to have caused or contributed to death.
CDC dot gov
Assumed