You didn't show that at all.
You merely mentioned an idea that was once somewhat accepted which was then later rejected.
I don't even know if textbooks even mentioned this idea, but I'll go ahead and assume it did.
You haven't shown textbooks presented this idea as "truth". That is just another claim of yours.
To show it was presented as such, you will be required to actually cite textbooks and quote it word for word.
Obviously it wasn't accepted without question, since if it wasn't questioned then it wouldn't be rejected today....