Evolution is the change in populations (allele frequency) over time, not the gene mutation itself. If 10% of the lizards in the article had this gene before the

Evolution is the change in populations (allele frequency) over time, not the gene mutation itself. If 10% of the lizards in the article had this gene before the storm and the 90% without it died off then the frequency has gone from 10% to 100%, which is overnight evolution.