I ask this just to be clear here: I accidently set the createForm property to false. I then expected a link event that should open another page only not to function any mor
Yes, because you are doing HTTP POST requests and they require a form.
You can convert your POST request link to a GET request link instead be removing the SSJS event and creating a "basic" link instead:
But if you need the SSJS logic, then you also need to have a form.