I'm not an expert, but I think that salvage title simply means the insurance company decided that it was a total loss for some reason. So it would be important to understand what that means in this case - it did say the bumper has been repainted, but that would not make it a total loss.
Also, maybe someone can confirm this, those windshield stickers remind me of PA safety and emissions inspection stickers from when I lived there 35 years ago - so potentially far from a rust-free CA car, other than the last three years.