The author is referring to traditional system administration - this is Windows - SCCM, SCOM, Exchange, SharePoint, VMware Virtualization, Citrix, Networking, etc.
SRE or "DevOps" roles new roles that are similar to system administration but the biggest difference is the use of cloud technologies, automation and most importantly those in need to be or at least understand software develop and code.
SRE or "DevOps" roles new roles that are similar to system administration but the biggest difference is the use of cloud technologies, automation and most importantly those in need to be or at least understand software develop and code.