Cant create image without alpha

Hi guys my first post here. And here my problem, I change Meltdown addon for baking and add checkbox for 32bit images and trying to set creating images without alpha here code
bpy.ops.image.new(name=“MDtarget”, width= job.get_render_resolution()[0], \ height = job.get_render_resolution()[1],
color=(0.0, 0.0, 0.0, 0.0), alpha=False, generated_type=‘BLANK’, float=job.get_float32())
but it still creating and save images with alpha, why it happens?

Here addon file https://yadi.sk/d/Rib_UNOVje2iX

nobody knows?