New vs replacement is a red herring. Replacing a split rail or 5’high barricade with wires every 2’ with our current steel system = a new fence. The area was not protected at all and now it is. The MSM likes to use that distinction to disparage the President’s progress but we don’t need to buy in to that fallacious & misleading distinction.
If you’d like to know the details then do the research, those questions have been addressed. With leftists using every phony excuse to slow things down there is no one who can be exact with any level of honesty but President Trump is famous for before deadline & under budget so the wall is being built as fast as is humanly possible.
https://www.washingtonpost.com/graphics/2020/national/immigration/border-wall-progress/
Bingo!