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Hello
I am running a droplet with Plesk. Most of the config files have something similar added to the header.
As I understood, if you make changes to /etc/hosts that would not be persistent and after a server reboot (or most likely) a reconfiguration/rebuild of files the changes would disappear. If you make the changes in the tmpl file that would be persistent no matter what, since you are modifying the actual template based on which the configuration files are generated.
It really comes down to what you need: a persistent modification or a “temporary” one (that you would be able to fix - if something goes wrong - in no time by regenerating based on the template files) Hope it helps!