diff --git a/airflow/models/variable.py b/airflow/models/variable.py
index 4b3e4f77e47e1..b4cf5560e8421 100644
--- a/airflow/models/variable.py
+++ b/airflow/models/variable.py
@@ -165,34 +165,6 @@ def set(
 
         This operation overwrites an existing variable.
 
-        :param key: Variable Key
-        :param value: Value to set for the Variable
-        :param description: Description of the Variable
-        :param serialize_json: Serialize the value to a JSON string
-        :param session: Session
-        """
-        Variable._set(
-            key=key, value=value, description=description, serialize_json=serialize_json, session=session
-        )
-        # invalidate key in cache for faster propagation
-        # we cannot save the value set because it's possible that it's shadowed by a custom backend
-        # (see call to check_for_write_conflict above)
-        SecretCache.invalidate_variable(key)
-
-    @staticmethod
-    @provide_session
-    def _set(
-        key: str,
-        value: Any,
-        description: str | None = None,
-        serialize_json: bool = False,
-        session: Session = None,
-    ) -> None:
-        """
-        Set a value for an Airflow Variable with a given Key.
-
-        This operation overwrites an existing variable.
-
         :param key: Variable Key
         :param value: Value to set for the Variable
         :param description: Description of the Variable
@@ -225,26 +197,6 @@ def update(
         """
         Update a given Airflow Variable with the Provided value.
 
-        :param key: Variable Key
-        :param value: Value to set for the Variable
-        :param serialize_json: Serialize the value to a JSON string
-        :param session: Session
-        """
-        Variable._update(key=key, value=value, serialize_json=serialize_json, session=session)
-        # We need to invalidate the cache for internal API cases on the client side
-        SecretCache.invalidate_variable(key)
-
-    @staticmethod
-    @provide_session
-    def _update(
-        key: str,
-        value: Any,
-        serialize_json: bool = False,
-        session: Session = None,
-    ) -> None:
-        """
-        Update a given Airflow Variable with the Provided value.
-
         :param key: Variable Key
         :param value: Value to set for the Variable
         :param serialize_json: Serialize the value to a JSON string
@@ -268,18 +220,6 @@ def delete(key: str, session: Session = None) -> int:
         """
         Delete an Airflow Variable for a given key.
 
-        :param key: Variable Keys
-        """
-        rows = Variable._delete(key=key, session=session)
-        SecretCache.invalidate_variable(key)
-        return rows
-
-    @staticmethod
-    @provide_session
-    def _delete(key: str, session: Session = None) -> int:
-        """
-        Delete an Airflow Variable for a given key.
-
         :param key: Variable Keys
         """
         rows = session.execute(delete(Variable).where(Variable.key == key)).rowcount