That's a contradiction though.
When you're talking about a fixed time line you can't use the interference as part of it. A fixed time line exists despite the interference.
In this case Bran is the interference. We seen Wylis before Bran. He was normal. Due to Bran's interference, he became Hodor.
A fixed time line would be Wylis becoming Hodor no matter what.
No matter what isn't "Bran always turns Wylis into Hodor". No matter what means he'd be Hodor without Bran. And we have no way of knowing that.
What you're talking about is predestination, not a fixed time line.
Fred.
There is no Hodor without Bran because each event is a fixed point on the timeline. There is no alternative timeline in a fixed timeline otherwise it'd be multiple timelines.
What I think is confusing people is linear thinking. It's a paradox like a catch-22, chicken or the egg situation. That in part doesn't cause an issue.
Most people accept the paradox for what it is, a time loop, while I think you and
@Silkk see the paradox/time loop as a logical flaw in your linear thinking.
If a fixed timeline exists despite interference then where does the interference come from? It's all the same timeline, just in an infinite loop