It doesn't. I don't have a link for you right now but there was a post on reddit recently showing that SynthID is removed from images by passing the image throu

It doesn't. I don't have a link for you right now but there was a post on reddit recently showing that SynthID is removed from images by passing the image through a diffusion model for a single step at low denoise. The output image is identical to the input image (to the human eye).