Yep, Horton, like R.C. Sproul,Sr., D. A. Carson, Greg Beale, Doug Kelly, Bob Cara, John Frame, Richard Pratt, Carl Trueman, and the vast majority of other contemporary evangelical Reformed scholars, is not a reconstructionist.
I think that’s a very good (and biblical) thing...
I don't see how what follows the "but" necessarily limits the preceding clause at all. Sounds like he may just be transitioning to illustration.