After removing the plugin from the conductor, the corresponding packages are still seen in SSR routers.
After uninstalling IPsec plugin from conductor and removing IPsec configuration from routers, the IPsec package on the routers still remains as is.
# rpm -qa | grep -i ipsec
128T-ipsec-1.2.0-1.x86_64
# rpm -qa | grep -i libreswan
libreswan-3.23-5.el7_5.x86_64
After removing the plugin from the conductor, the packages are still seen in routers. This is an expected behaviour for IPsec plugin.