His Outback had the 3.6L H-6 engine, which wasn't listed in that bulletin. He still had a ridiculous level of oil consumption. You'd think the issue might exist in other engines if they were designed by the same engineers.
Interestingly, this circles back to the ZDDP issue. The concern was that in older engines with higher oil consumption, more of the phosphorus in ZDDP would make its way into the exhaust and poison the catalyst prematurely. With such high oil consumption on low mileage engines, I'd think Subaru would be concerned about this issue since they have to warranty the cats through 100,000 miles.