What does your owner's manual say about recreational towing. If it states the vehicle is approved for 4-down towing then it is approved. Subaru cannot change this unless they formally issue a statement in writing rescinding this authorization that is sent to ALL registered owners. Then you contact a lemon law attorney and start proceedings to have the vehicle bought back at FULL purchase price + attorney's fees. I worked in the automotive industry for 35+ years and manufacturers will try to change the rules until they are confronted legally, then they will back down and offer a repurchase.