Chrome 70 will distrust all Symantec certificates
My experience with Chrome 66 Beta and older Symantec certificates is that it completely blocked you from opening the page - it doesn't just warn you it's insecure. Maybe they changed that for the public release. I had to complain to my web host that their own login page was affected - they did eventually fix it.
According to Google (https://security.googleblog.com/2018/03/distrust-of-symantec-pki-immediate.html), Chrome 70 will stop trusting ALL Symantec-issued certificates "including Symantec-owned brands like Thawte, VeriSign, Equifax, GeoTrust, and RapidSSL"