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I noticed the article also misidentifies the 535d's engine: unless I've missed some new development, BMW's N57 is their latest diesel, but it is a single turbo used in the 330d and developing 245hp. The more powerful sequential turbo engines are designated M57 and they're actually not as new as the N57s. Given the 535d uses the sequential turbo setup, I think it's actually running a variant of the M57.
It's interesting how there's the same sort of "N55 vs N54" relationship between the two engines: the N57 is technically newer and more advanced, but the M57 seems to be the choice for BMW's more powerful models.
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