The blog post shares the details of our analysis:  https://www.netskope.com/blog/a-real-world-look-at-aws-best-practices-root-accounts

The Netskope Security Cloud makes it easy for you to check if your users are following these best practices, following the CIS AWS Foundations Benchmark. You can find and enable the four rules by searching for "Root" under the CIS AWS Foundations Benchmark profile. 

If you have already enabled the CIS AWS Foundations Benchmark profile, you can view the results across your company.  Search "root" under the "Rule Name" filter to identify the four rules and check your results.