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The author of this article seems to be confusing trading with transactions.
Also 6 confirmations (for a transaction) is just the recommended amount, really just an arbitrary figure from 8 years ago. Many businesses choose to allow fewer confirmations. In the past it was possible to be reasonably confident that a transaction with zero confirmations was legitimate - a merchant could decide in less than a minute that the transaction was going to confirm - but changes to Bitcoin Core in order to support Lightning now mean that no longer works.
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