adds reference to new method and uses getter instead of static member

src/Plugin.php

@@ -157,15 +157,17 @@ public static function addCustomUserRoles() {
 	 * When defining a CustomPostType, you must also define a model for it, which extends the CustomPost class.
 	 * The existence of a model is checked in the @see PluginTest::testGetCustomPostTypes() test.
 	 *
-	 * @since 2.10 only returns custom post type enum string
+	 * @see Plugin::getCustomPostTypeClasses()
+	 *
+	 * @since 2.10.3 only returns custom post type enum string
 	 *
 	 * @return string[] enum array
 	 */
 	public static function getCustomPostTypes(): array {
 
 		return array_map(
 			function ( $type ) {
-				return ($type)::$postType;
+				return ( $type )::getPostType();
 			},
 			self::getCustomPostTypeClasses()
 		);