since they are enforcing KYC on nearly all of their users nowadays and also they are under a lot of pressure from the government and that will only increase over time, i am going to say with confidence that what they create is NOT going to be decentralized.
basically every time you see a "company" create something, it can not be decentralized and even if they call it that, it won't make it so.
The fact that half of Binance Chain nodes will belong to Binance proves that DEX is not quite decentralized. But we will see how that thing will go. Gaining popularity will make some people parse into database the chain records and if something changes shit will float above water anyway. That is some kind of overvwatch. Lets see what the chain will look like.