Good day.
This plugin shouldn't be capable of doing this unless you have something else that's going back to Scene_Boot on the title screen.
The normal flow without this plugin:
Scene_Boot -> Scene_Splash -> Scene_Title
With this plugin:
Scene_Boot -> Scene_PretitleSplash -> Scene_Splash -> Scene_Title
This plugin aliases the SceneManager.goto function, checks for what the current scene is, and what the scene called is, and injects scene_pretitlesplash only if it's currently in Scene_Boot and going to either Scene_SPlash or Scene_Title. It doesn't change anything on the title scene at all, and the only time is plays splash screens is on the pretitle splash scene. The only way it could replay these is if something sent the interpreter back to Scene_Boot and it started the whole process over again.
~Ramza