That is a previous Symantec incident from 2015. It certainly adds to the history of issues they've had, but Google announced their plans to distrust Symantec in this more recent blog post, in response to a series of misissued certificates that came to light in January 2017:

https://security.googleblog.com/2017/09/chromes-plan-to-dist...

After Google published that post, Symantec responded with their own open letter objecting to Google here:

https://www.symantec.com/connect/blogs/symantec-backs-its-ca

However they subsequently relented, and decided to sell their PKI business to Digicert rather than rebuild it as would be necessary to regain browser trust.