Most automation that you know of as “devops tools” are borne from sysadmins.
Terraform was written by a sysadmin; puppet, ansible, saltstack and cfengine too.
It is revisionist to think sysadmins were not automating their jobs.
Old school sysadmins used to know C, bash and Perl.
New school devops just traded that for a handful of DSLs and Python.
I’m sure some technicians working the IT department managed to get by running scripts created by sysadmins and claiming not to code, but it was definitely the common case that 20 years ago sysadmins could code and worked tirelessly to “automate themselves out of a job” (literally a mantra i was told as a sysadmin 15 years ago)