This event is in fact called when using this "fullupdate" command. It can be used to reset tons of settings in most plugins because this is where they initialize variables for the round.register_event("ResetHUD","newSpawn","b")
I made a simple plugin that blocks this command form resetting the HUD. I have not found any valid use for this command so blocking it should be safe.
Plugin now logs attempts to "fullupdate.log" in the logs dir.
Just load this plugin before any plugin you want it to affect.
get plugin