It's not much of a guinea pig if you're just asphyxiating him, its pretty understood how that kills people. By the logic of calling him a guinea pig does that mean anytime anything is done to someone for the first time they're a guinea pig?
There are lots of ways to asphyxiate someone, and not all of them are fast and easy. And yes, guinea pigs having been used in lab experiments, that’s exactly the logic.