I think he is saying that the EU is inherantly irrelevant because the OT is the OT and whatever drama, characters and plots the EU devises doesn't matter because it won't change the OT.

I can understand this perspective, but I don't really agree with it. Information contained in EU changes how you view the OT. This is the whole theory behind the existence of the PT. If the OT is already made then why make the PT, you know how it ends and the characters and plots of the OT already exist so it could never affect them...right? But actually no. Darth Vader changes his entire character, you realize half the people in the films have a pre-existing relationship, and you get a lot of other background information that goes against what you assumed.

Obviously, this sort of change can be for the better or for the worse (and we all know which category most of the prequel information falls into). But it happens, so material that fits around and within the OT can have pretty profound effect on how the OT plays out.