I’m watching the chapter 6.8 of the "Google Certified Associate Cloud Engineer 2020" course,
And it seems that the link to the mental models leads nowhere ??
Here is a screenshot of what I get :
You need to goto Home or Dashboard of acloudguru.com, make sure you are signed in.
Search this Course in the search bar " aws-certification-preparation "
Check Bonus section – Chapter 6.
Hope this helps.