I don't agree to that because I believe Satoshi exists but my confusion is if he's a man, woman or a group of people that decided to make use of the name to confuse anybody trying to know who they're but from the different things that has happened, I think we can rule out the possibility of Satoshi being a group but more of an individual that is hiding his identity very well. Satoshi might be died and we won't know and that makes me believe that Satoshi can never be found.
Assumption without evidence proofs he doesn't exist because what can you use to judge his existence, not like his supposed "claimed" wallet has been moved a while, it's not like there has been a developer who pass BIP are anonymous, most of them are known atleast by the community for some safety and security of the network but none proof to be Satoshi. If only there is Satoshi by my own assumption, then it can only be a group of people who decide to make it looks this way.
I think there's no one that know who Satoshi is because if there was, they would have betrayed him since, for the reward that the federal government will be offering. Satoshi knows that if he reveals his identity, it's going to affect the market and the growth of Bitcoin hence he choose to stay anonymous forever and that's the best thing he can do.
There were people on this forum that started early with him and would have make it easy back then to know much more about Satoshi but they refused not to do it. There was a time the administrator wanted to share the IP address login of Satoshi on the Bitcointalk but some reasons due to privacy, they refused and it's obvious we know why they didn't. If really Satoshi is going to be betrayed, I'm sure there would be lead many years before now but because the people that were here understand the mission and they have carried it along with them. Bitcoin will remain Bitcoin with or without Satoshi.