Even if the mutation was part of the original soup of bacteria, the process in the video still shows evolution. Either at time=0 or some point in the future, a

Even if the mutation was part of the original soup of bacteria, the process in the video still shows evolution. Either at time=0 or some point in the future, a strain of bacteria was more fit to survive and produce viable offspring than the others that died off in the presence of the antibiotic doses.