He is being a bit dorky but there is truth to some of what he's saying in terms of "making digital look like film" being questionable. However with someone like Deakins I suspect if you asked him he would make the argument Tarantino himself states that he's using digital to create something that wouldn't be possible with film rather than just aping it.
I would say the most fundamental difference is less about colour or post processing(which is equally possible with scanned film) and more the very nature of the two mediums. Digital can have image noise of course but its not the same as grain, with film the image itself is built of grain which gives a different arguably smoother look to the exactitude of digital. Something like Blade Runner 2049 for example isn't beyond some basic design influences trying to look like Scott's original, its both more minimalistic in some ways much also looking for hyper detailed textures which digital brings out more of. I would say the same with other highly rated visual films from more recent years shot on digital like say Under the Skin or Blue is the Warmest Colour, the very exact look of digital is part of their nature. I mean personally as a photographer I do very much tend towards playing up this aspect in my work rather than looking to ape the look of film, when I want something to look like film I shoot film.
This for example playing up the detail on the frosty landscape with digital even with a relatively small file compared to my original. Its not just about "detail" which film can have plenty of but of higher perceived sharpness with more exact edges to things that shows up even on smaller files.
You could argue of course that in shooting Hateful Eight on 70mm Tarantino himself actually played down the difference as the larger format makes the grain structure less obvious, its why Kubrick for example shot 2001 on that format to give it a very "exact" look. That and Hollywood are probably my favourite films of his post Pulp Fiction though were he seems to have moved beyond being a script focused director towards a more visual one, hope he doesn't keep to his 10 film retirement talk now as I think his future career looks more interesting than it has for along time.