Greetings Chong and welcome to CAF.

another way of saying this is the Word of God is not limited to the written Word only. Never was and never will be.
There maybe historical events that are carried from one generation to the other orally. Though, the validity of that information is as good as the memory of the transmitter, if personal biases makes the content change then the message loses originality.
Can you provide a reference to this? Even a circular reference would be sufficient for now.
1Tim 2:11: Let the woman learn in silence with all subjection.

Lets see, would that be scripture itself, thus nullifying this point? If everything you say were true then the OT would have to be sufficient for salvation and the NT would be subordinate to it, something the Jews would agree with you on.
Now if you want to confess that all of scripture only became scripture after Christianity began, then I could see your point, but I don’t think you want to agree to that, right?
The OT was a preparation of the NT. The NT would have focused ONLY on Jesus and nothing else. But it is expanded to include the 1st apostles of Jesus as the people entrusted with the Good News by Jesus himself.