In response to these accusations I've posted proof of lineart/layers, timelapses, WIP, sketches, evidence of my work and consistent style going back well before generative AI existed.
I think under any other circumstance this would be sufficient evidence. I am sympathetic to people's anxiety about this issue, and will keep posting more work. I don't know what specifically will be required, it kind of feels like there's not a piece of evidence that won't be subject to suspicion.