Both solutions are possible and easy to do. Trigger solution: just add the action "Hide unit status bar". Data solution: go to the Actor of the unit you want it's health bar will be hidden and go to the section "Art: Unit Flags +". Just enable the "Supress Default Status Bar" option
Using triggers, how to hide the health bar of a unit? If impossible to do with triggers, how to do it with data?
Both solutions are possible and easy to do.
Trigger solution: just add the action "Hide unit status bar".
Data solution: go to the Actor of the unit you want it's health bar will be hidden and go to the section "Art: Unit Flags +". Just enable the "Supress Default Status Bar" option
pretty sure you can also use the action of overriding player settings to have hp bars not show for player X.
@Chris97Ong: Go
you can also do it unit wise by sending an actor message to the unit actor.