No, that is how Natural Selection works, not Evolution. This is a demonstration of natural selection, as the resistance was already resident in the DNA.
Natural Selection != Evolution.
> This is a demonstration of natural selection, as the resistance was already resident in the DNA.
It doesn't matter which came first, the external pressure or the genetic trait. In both cases it's evolution.
The paper specifically based its analysis on SNPs, a large fraction of which are novel mutations that did not exist in preexisting fixed alleles.