It is possible or likely the aftermarket "relay" received power by the inline fuse holder and blue wire, which is disconnected.
Why not trace so far as you can the wires still connected to that aftermarket "relay" so far as you can. There might and surely likely be a wire that switched the relay so it carried power. A wire coming from a switch perhaps. Or it might have a wire that triggered from the ignition. Be sure all is safe before fully disconnecting.
Can you read any markings on that aftermarket "relay"? You might be able to get it or its purpose and hopefully its terminals' purposes identified by the makers. That could help you to remove it safely.
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