Isn't the entire point of this article that we want mutability? Sometimes a record is wrong and needs to be corrected. A blockchain works when the only facts it

Isn't the entire point of this article that we want mutability? Sometimes a record is wrong and needs to be corrected. A blockchain works when the only facts it records are completely dependent on the blockchain itself. If you're trying to record facts about the world, the actual world is the authoritative source. The author's point seems to be blockchain is not likely to work for applications in which a misrecorded or forged fact would require you to discard the entire blockchain and start over if it was discovered. It only works when the facts you care about are facts about the blockchain itself.