Hi, and welcome.
Why did Subaru repurchase it? I would imagine a repossession (such as for lack of payment) would be done by the bank or credit agency and not by the manufacturer (but then maybe Subaru bought the car back from the bank?). The only reason I'd think Subaru would buy a car back is from extreme dissatisfaction from the first customer...either really did not like it or too many mechanical problems (Lemon Law).
Can you get any information from the dealer on why it was repurchased? If it was for something not related to mechanical reliability, then I probably wouldn't worry about it.