Wrong.You might like to know Subaru recommends a fuel additive every oil change possible every other.
The only fuel additive Subaru recommends is an anti-freeze additive in cold weather.
"To help prevent moisture from forming in the fuel system and the risk of its freezing, use of an antifreeze additive in the fuel tank is recommended during cold weather. Use only additives that are specifically designed for this purpose."
"Use of a fuel which is low in quality or use of an inappropriate fuel additive may cause damage to the engine and/or fuel system."
"If you continuously use a high quality fuel with the proper detergent and other additives, you should never need to add any fuel system cleaning agents to your fuel tank."
This information is from the 2020 Outback owner's manual - other models and years are similar.