Yes, Satoshi will be very happy because bitcoin still maintain being decentralized, just that people are the ones that like to use the centralized platforms for it.
The way Satoshi designed bitcoin makes us know that people like what is centralized which makes humans the failure to make something to remain decentralized.
Bitcoin network is still decentralized and nothing has changed about that. People are the failure and not bitcoin. Non central authority has control over bitcoin.
I think Satoshi would be very much excited to see the extent his idea has reached . Satoshi created bitcoin for a purpose which are decentralization, as a store of value, and up till date nothing about why it is created has changed instead it is growing in value and adoption.