well yeah noise rock and its relationship with hardcore, post-hardcore, and etc can be confusing
original noise rock in the 80s was - especially in America - almost all hardcore-adjacent but not hardcore
i.e. Big Black, Scratch Acid/The Jesus Lizard, Butthole Surfers, etc
and the band that (basically) invented noise rock - Flipper - also pioneered slow hardcore that Black Flag etc later took and run with
which Nirvana et al then took and gussied up with 70s classic rock hooks etc to conquer the world with grunge
meanwhile - early 90s - part of hardcore become "post-hardcore" and/or screamo, and cross-pollinated with the mathier ends of 80s indie
then that mid-late 90s next gen of technical hardcore, metalcore, etc - that's where Dillinger etc come in
and that soon cross-pollinates with prog metal and djent and whatever
meanwhile emo becomes Dashboard Confessional, math-rock becomes regular shitty prog, the early 00s rock zeitgeist is a return to basics i.e. The Strokes