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It connects to their own server ("the users are sharing a single node controlled by BlueWallet")
Yes, that means that they are not hosting LNDHub lightning wallets any more, but what I mentioned is different.
The wallet connects to a central LNDHub node to obtain information about the other wallets. They still obviously have that service. You can use your own LNDHub instead of that one if you want by going to Settings->Network->Lightning Settings
You can for example have a LNDHub wallet from Alby and it will still work on BlueWallet.
These are two different things.
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