Since it's a MY19 (assuming it is less than 36k miles), the factory bumper to bumper warranty should apply. I'd check with SOA if that warranty transfers to you when you purchase the car and if the dealer needs to do any paperwork to have that transfer to you. Those terms and conditions keep changing from year to year, so I'd confirm that.
Like others have said, it's a marketing thing. Nothing really is lifetime; and you'll often find things like wear and tear exemptions in the fine print. That will be a harder battle to win and prove that it was a failure due to a defect vs just wear after 150k
Unless the CPO has something of value to you, I'd negotiate a discount without the CPO or lifetime and pick up a Subaru Gold Plus warranty for the years/mileage that make sense for your driving habits. In my opinion that is more peace of mind for the buck.