You're inflating your numbers (which I already did by including the hook, which I wouldn't, as it's harder to use well). No, combinations aren't techniques (that's why they're called combinations). And forward/backward footwork isn't separate techniques, that's the movement with the technique (the punch, alone, isn't the full technique). Will that win boxing matches? No. But it will produce useful fighting skill, which was the point. You're arguing really hard about the number of things, which is well beside the point. Complexity is more the point.
But let's play the numbers, and account for complexity with it. Single-leg, same side. Single-leg, opposite side. Single-leg, same side, front. Single-leg, same side, back. We're at 6, just accounting for the obvious variations in a single technique for grappling. And every one of those is a more complex movement than the jab.