Definitely not true unfortunately. In particular it's not true for areas colored red or blue, because the green channel doesn't have the luminance information -

Definitely not true unfortunately. In particular it's not true for areas colored red or blue, because the green channel doesn't have the luminance information - that's why I mentioned them. Lightroom and at least one current phone camera have ML Bayer demosaicing for this reason and it's visibly sharper. (Note sharpening and enlarging are the same operation.)