This is true, but it can be avoided as a lot of others checks that they do if u know what u are doing
The thing you are looking is ad inside DIV which is set to opacity 0. And according to all that you described that is the basic concept of adsense clickjacker which is used today only among those who don't have skills and knowledge to code something more advanced.
There is a lot of factors that gets you flagged and with that kind of jacker you will pick up all of them. Do a better research before you even try it, else you wont even reach your first payment