What does "Batim Mele'im Kol Tuv" imply?
Ramban (citing Chulin, 17a): It incorporates even what is forbidden, such as sides of pork - to teach us that any food that Yisrael found during the conquest of Eretz Cana'an was permitted 1 irrespective of whether it was Kasher or not. 2
What are the implications of "Boros Chatzuvim" and "Keramim ve'Zeisim ... "?
Ramban #1: They imply water-pits that have perhaps been smeared with forbidden fats 1 and vineyards and olive-groves that are Kil'ayim or Orlah.
Ramban #2: it mentions them to stress the extent of the bounty that they encountered when they entered Eretz Cana'an.