even he knew or not if satoshi is dead still this person will claim the title because He is looking after the benefits he might have if he fooled the world and took the title from the real Satoshi Nakamoto.
Then again he cannot provide any proof that's why suddenly many people confuse to him so maybe it's best for us to move and not believe on any claims coming from him since listening to him is just a waste of time, finding the real Satoshi still a mystery right now and if he's alive maybe he need to show up to eliminate those fakers.
how can he Prove to be the one when he does not have Proof of claiming?simple thing to do is Sign a Message to the wallet addresses that Satoshi has so that can save everyone's time for this issue?but why can't he provide this?because he is a Faker.