Great, another screamo/post-rock band mislabeled as black metal.
"alongside the aforementioned, bands such as Alcest"
1) Alcest (founded in 2000 - first album in 2007) started the black metal/shoegaze style
2) Contrarily to the bands you mentioned, Alcest came from black metal
3) Even Deafheaven's guitarist has mentioned this as a reaction to media like yourself labeling them (partially) black metal