So if I run
certbot certonly --webroot -w /some/path --installer nginx
or
certbot certonly --webroot -w /some/path --deploy-hook "some command"
It will get reloaded on renewal. (Even though I don't know if the difference between certonly and run is meaningful in these commands)
But if I run
certbot certonly --webroot -w /some/path
it will not.