Changes to shoe technology are rudimentary and indeed shoes have changed little in decades. The latest innovations are the first in which it is being claimed they have a demonstrable effect on performance. That effect is only being estimated, as some athletes have made no improvements from using the new shoes.
Doping, however, has continued to be developed, as scientific innovation, modern medicine and pharmaceuticals are in a process of constant change and improvement. It is why doping remains ahead of antidoping. It is why the numbers doping will be much greater than those caught. Only a fool or an ignoramus will discount its effect on modern performances. But there you are.