TCW makes it abundantly clear that Lucas will trample over the EU if there is something he disagrees with: the crystals used in lightsabers are referred to as "kyber crystals," he insists that a vibroblade cannot stand up to a lightsaber (they could in KOTOR), there was retcon on Mandalorian society, Adi Gallia and Even Piell's deaths were retconned, there was a change to the political situation on Dac (and the planet was called "Mon Cala"), and Darth Maul was brought back. Lucas' handling of TCW and pretty much making zero attempt to work it in with established EU leaves me no reason to think that his treatments of the Sequel Trilogy will be any more favorable to the EU. I think that's just wishful thinking. However, as to how much he knows about the EU, there have been confirmations by those close to him that he does follow the comics and does keep on eye on the games to some extent. That by no means makes them canon since he's largely uninvolved in their creation, but apparently he does read the occasional comic, so the bit about him not reading any of it or following it at all seems like it might be a bit outdated.