So Google will be moving to distrust the “Class 3 Public Primary CA” root certificate operated by Symantec Corporation, across Chrome, Android, and Google products, because it is no longer going to adhere to the CA/Browser Forum’s Baseline Requirements.
However, the blog post says that
Symantec has indicated that they do not believe their customers, who are the operators of secure websites, will be affected by this removal. Further, Symantec has also indicated that, to the best of their knowledge, they do not believe customers who attempt to access sites secured with Symantec certificates will be affected by this.
How comes that?
UPDATE (after StackzOfZtuff's answer):