So Charlie Cox confirmed that the Matt Murdock we saw in NWH is not the same character from The Defenders Saga, but a reimagination, a "Born Again" in his words, but also he said that some things from that shows will stay as canon, so a MCU fan should watch those shows to see some things that would become canon to the MCU, also because they are so good, or at least most of them, so if someone reading this is a fan of the MCU and wants to know everything from the universe, only see the 3 seasons of Daredevil with 13 episodes each one and the only Defenders season with 8 episodes, they are on Disney+ without any cut scene from Netflix's version
Also in my headcanon, they are still canon, because of the references they make to the films, but the official statement indicates that there are 2 main MCU timelines, the MCU main films and TV shows + the other ABC shows, Helstrom and the promotional ones, and the Knights/Young Adult timeline with the first 3 phases of the MCU addiitionally