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The article is about blockchain technology (the title is misleading). So the append-only feature is implied, at least I hope so.

Guess the question is why you want a network of nodes, all of which may append a fake record, if you only want no one to change the data.

No can append a fake record without the matching private key needed to sign it.

Yes, the point is that decentralization consensus doesn't help.

Now you're moving the goal posts. It does help because it adding or removing from the chain will be noticed.