To "stay true to Nolan's vision" sounds like they will try to replicate what Nolan did. Here I should say that theoretically I don't think remakes are a bad thing. Movies have been being remade since the early days of Hollywood, and ideally a remake should be an invitation to alter or to expand, not stay true to the original.
This is an absurd justification. The idea is that people re-watch Memento many times, and yet always feel they need to see it again. This is a big compliment for a movie. He thinks it's the reason they need to re-make the film, when in fact it's the very reason it does not need to be remade. If people had grown tired of Memento, if it didn't hold up after multiple viewings and no one ever wanted to see it again, then a fresh take on it might be understandable. But Lervolino has stated the opposite (which is true for me--I've enjoyed the film immensely each time I've seen it and would always be willing to watch it again), in which case we should be grateful for the movie as it is and that we'll always be excited to re-visit it.