I just read the guidelines again and it is mute on the issue.
Maybe a photo pre-processing section in the guidelines would help:
Cropping should be encouraged.
I think adjusting light and white balance are acceptable.
Retouching should be banned or at least discouraged.
AI enhancement should be discouraged, keeping in mind that it might not be a conscious action just a device setting.
Observers might need advice which features would ruin their observation photos (focus stacking should be OK) and how to set up their device to turn those features off.