I don't think it's beneficial to the TDIs in general. We don't tend to have injector or pump issues, and Canadian diesel fuel is in much better than US junk (which would prevent HPFP failures). My personal experience is over a whole bunch of different tdi's, some well maintained, many not until I got them, and i've never had a fuel related issue. We don't worry about it with the 2010.
When you get into the CR pickups, then you start getting into injector issues. The 03/04 Cummins injectors weren't designed for ULSD, so they always fail. The injectors in the LB7 Duramax (01-04) are also notoriously weak and they give trouble. Having owned both of those trucks (and had to do injectors on both), I always use some sort of additive in those. The Ford Powerstrokes (aside from being complete junk) suffer from stiction of the injectors so a proper additive is practically required.