I disagree. He wants the wall. He has good reason to want it. Illegal immigration is a serious problem. Also, he promised the wall (very loudly), and he wants to do what he promised. Also, his base wants the wall, and he wants to do what his base wants. Plus, at this point, he's got a lot of ego riding on getting some type of "wall" built.
This argument feels like semantics to me as to me it sounds like you both kind of agree. He wants the wall because he promised it but I doubt he personally cares about a wall or even about illegal immigration. I think if he really wanted it beyond just not wanting the criticism something would have happened in the first two years where they had the best chance to do so.