If you do not want to the Symplify script to try to send events to GA4 you can disable it in the project management UI. To disable this as a default for a website go to My websites-> click the website -> Edit website -> Tracking -> Uncheck the Enable Google Analytics -> Save. This will make all projects created from now on to have this disabled.
Note that if you already had a project created before turning this off you need to open the editor for that project and disable events in Settings -> Extended tracking -> Google Analytics Integration.