I would click through some of the examples in your wiki link and try and notice a few things that most of the antebellum houses have in common. They're usually defined by the their blocky shape and the large columns in front; very Greek-revival.

This house, however, has completely different details and layout. Beyond the fact that it's missing the telltale columns and imposing silhouette, the design is more intricate and a touch more delicate. The Victorians loved fine details, and were very 'extra' in that way.

But honestly, all of that aside, the biggest tell is just the date it was built. A different style was simply the fashion then compared to earlier in the century. Just like how mid century modern was it's own thing outside of WW2 era suburban homes, though they're similar.