Not afaik they need a plains biome for the mutation to occur the same as the sinister\fiendish\demonic need the "hell" biome, I haven't looked into whether the EBXL biomes being flagged as various vanilla biomes counts or not (I know meadows counts as plains for Gregtech bauxite ore generation) so you could try that and if you haven't got the mutation within a few generations I'd say not.