This summary is not the rule. The rule text controls.
This rule just gives the rules their official name. It says that all the rules used in Alabama civil court cases are called the Alabama Rules of Civil Procedure. Anyone referring to these rules, in court documents or elsewhere, should use this name.
The rule also covers district courts. Even though district courts use a modified version of these rules, that version still goes by the same name: the Alabama Rules of Civil Procedure. This keeps things simple, so people don't have to learn a separate name for the district court version.
For anyone involved in a case, this rule doesn't change how the court works. It's just a naming rule, so everyone uses the same title when they talk about the procedures that apply to civil cases in Alabama.