There is no evidence that Lowry erased grain and put fake grain back in. That is pure conjecture. No one has ever shown proof. And not for one moment do I believe James Cameron would accept that. Come on now.
Lowry is not Blue Underground.
The contrast boosted GHOSTBUSTERS BluRay was a complete disaster and has since been shamed by the new 4k master released on Blu and it looks so so much better.
Of course, to each their own. :)