I see a significant difference between radio buttons and the proposed solution. The change of state with radio buttons require a simple pointing and click. While with the sliding frame, a pointing and a constrained sliding operation is required.

When using a mouse the radio button is the most simple and efficient widget. But when using touch screens, the sliding frame seems a better solution because it avoids accidental state change, while still being a natural and intuitive operation to do with the finger.

So I would say that for touch screen devices (especially phones) the proposed solution is excellent and better than radio buttons.