The octonionic theory vs. stringy multiverses

In the octonionic theory, there are no free parameters and no fine tuning. The trace dynamics Lagrangian and the algebra of the octonions are supposed to determine all the free parameters of the standard model. In fact if we have to ever to introduce some freedom / fine tuning, we would prefer to discard the theory in totality, instead of trying to save it by some quick-fix. The octonionic theory transforms string theory into a predictive theory by retaining extended objects but modifying the dynamics.

The multiverse / anthropic / landscape way of making string theory `predictive' is the exact opposite of the octonionic theory. String theory can give rise to a very large number of different kinds of universes, with different values for the fundamental parameters. Our universe has it's particular parameter values because these values allow life to arise. Theory wise there is nothing special about these values, just as there is nothing special theoretically about the distance of the earth from the sun.

I think most people will agree that the first way of saving string theory, if it works, is the preferred one. I think most people will also agree that proponents of the second method should carefully examination proposals in the first category, when such proposals are brought to their attention.

I am at a loss to understand on what scientific basis string theorists have concluded that a solution of the first type is impossible.