Point #1 and point #2 are separate in that you there is only so much weight you can lose. At some point you HAVE to stop being in a calorie deficit… or you die.
The biggest health benefits come first from being a healthy weight, so losing weight via calories in/calories out until you reach a healthy level is point #1.
THEN point #2 becomes important, what do you do then to maintain a healthy weight, and which approach is optimal?
EDIT: On losing weight to get to a healthy target weight. There are a TONNE of different approaches, but they all pretty much boil down to CICO as I said above.