The strand conjecture: a complete, unified theory of fundamental physics

It works in 3 dimensions, and predicts the lack of supersymmetry.

If it predicts supersymmetry, it is falsified. Right?

The strand conjecture is falsified if supersymmetry is found, because it predicts that supersymmetry does not exist.

The strand conjecture can also be falsified with a few hundred other experiments. A partial list is here: www.motionmountain.net/bet

In a few words, the strand conjecture predicts the lack of additions or modifications to the standard model of particle physics and to general relativity. It might be the only conjecture doing so. So far, this summary prediction agrees with all experiments.

Is this a slightly rebranded string theory?

No. The two contradict each other.