The Mechaber is teaching us over here that even if the bird was alone In the pot, it would still be permitted, for he doesn’t hold of the laws of a piece becoming nveilah outside of cases involving milk and meat. He doesn’t agree that something attached absorbs faster. Others disagree and therefore rule that the laws of nveilah apply to everything.
 Meaning that it has sixty against the entire heart, and not just the blood gathered inside. Therefore even a whole heart that wasn’t salted, or that was not kosher and was cooked with a chicken, is permitted, for the chicken will have sixty against this heart.
 If the heart became attached through the cooking process, it is not considered as having been attached.
 The reason is that a piece that has something attached to it will absorb faster from that item than anything else in the pot. All this is regarding other items in a pot which are permitted if there is sixty against the bird. The heart will remain forbidden even if the bird has sixty against it.
 The reason is because it is common to remove its head, skin, and other parts before salting it, therefore it is likely to lack sixty against its heart. Even poultry only has sixty against its heart if the skin was not removed.