Question About Directive Scripts

[P5vc]

The directives directory contains bash scripts to be executed once on each host, immediately when they are discovered. Only directive scripts with modification times within the most recent 24 hours will be considered for execution.

Does this mean that if I set up a new server, but I haven't updated the directive script within the past 24 hours, it won't run? For example, let's say that I want to fully wipe and set back up a server with the same hostname, etc. Would that server no longer run the old directive script? Or, is this trying to say that directive scripts won't be re-run (after always running the first time) unless a recent change is detected? Thanks.

Edit: Also, will directives run for all hosts, or is there a way to choose a specific host/specific hosts for them to run on?