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Does this part include the actual glass lens (or is it just the metal ring) and i assume I need an adhesive ring, this part? If these are not the correct parts to replace a cracked 6S Plus rear camera lens please point me to the correct stuff. Also can the lens be replaces from the outside with a heat gun (some you tube videos indicate it can)

the framing is “spot welded” onto the frame of the device. You can remove it but the trick is finding something strong enough to hold the new camera lens in place with regular use. or you can remove just the glass lens if your lens frame is fine. I don’t recommend trying to do this without removing the rear camera however as a little bit of glass can fall onto that camera lens, scratch it, and make it so you have to buy a new one.