Am I wrong in my ideas about the lion king 2 relations?

So my theory has always been that Nuka and Vitani were Zira and scars son and daughter and that Kovu was Ziras son father unknown. According to this video hat is no so. Am I wrong is this video right? I realize that the lion guard can retcon all this. So thoughts?
https://www.youtube.com/watch?v=MrwnzdxwmTc&t=55s
https://www.youtube.com/watch?v=MrwnzdxwmTc&t=55s