Yeah the 507 is meant to help extend the life of the DPF so theoretically you could run just about any HDEO if you are doing a DPF delete.
My ? is has this car already driven past the mileage extension limits (162k) for the diesel gate warranty? The TDI warranty pretty much covers everything from the fuel fill nozzle to tailpipe (except transmission) that will trigger a CEL and doing the delete will null and void the warranty leaving you on the hook for repairs.
And given how problematic and expensive the high pressure fuel pumps are on these cars, you'd absolutely want that warranty in tact.
If the HPFP goes out of warranty you're out thousands, as essentially your entire fuel system has to be replaced due to possible metal particle contamination.
Some TDI guys think you can extend the pump life with consistent use of Stanadyne at every fillup, but the jury is still very much out on that one.