The MoC in question did not use a secondary green and had only Sand Green as the colour. Meso’s statement regarding recolouring applies only to the other colours on that MoC, and in this case would apply to the Dark Green being recoloured to Sand Green.
Obviously in a case where Sand Green is already the colour of the MoC, we would not be allowing recolouring.
@Hazash I can’t actually confirm that but I’ll get Meso and Eljay to take a look - pictures aren’t something where I’m fully aware of what they’re looking for.