from the paper you plagiarized for your math:
Darwinian Evolution Can Follow Only Very Few Mutational Paths to Fitter Proteins Daniel M. Weinreich,* Nigel F. Delaney,† Mark A. DePristo, Daniel L. Hartl
They write this as their general method for estimation.
" To estimate the relative probabilities with which evolution by natural selection for heightened cefotaxime resistance will realize each of the 120 possible mutational trajectories from TEMwt to TEM*, we assumed that the time to fixation or loss of individual mutations is far less than the time between mutations the strong selection/weak mutation[ model of (15)^.
Thus, the relative probability of realizing any particular mutational trajectory is the product of the relative probabilities of its constituent mutations, because under our assumption the choice of each subsequent fixation is statistically independent of all previous fixations (12). Next, for each allele we partitioned all possible mutations into those that are beneficial, deleterious, or neutral with respect to cefotaxime resistance. The probability of fixation for a beneficial mutation far exceeds that for deleterious or neutral mutations (12, 15) and, because all alleles have one or more beneficial mutations (Table 1), we approximated the probability of fixation for all other mutations by zero."
my bold
This is their simplified model for certain highly selective environment, all you have done is repeat this with more verbiage and symbols as your own paper. It is not some new understanding it is only your specious conclusion that this somehow precludes evolution.