image – Is converting from PNG to WebP format still effective to prevent facial recognition?

Fawkes was used to cloak the PNG images and the images were then converted from PNG to WebP format using Google’s official cwebp.exe. Is the cloaking still effective to prevent facial recognition on the converted images?

The usage for the cloaking software is to make pictures of humans unidentifiable to malicious bots (preventing/making facial recognition harder).