It’s not misleading it’s just written in a passive voice.
If you read the whole sentence it’s fairly clear that BlackCat is the subject that is doing the claiming. There’s room for making it more clear but it’s not misleading as written.
Yeah, I wouldn’t call it misleading, but it’s poorly written for sure. Active voice would be clearer and more succinct, e.g. “BlackCat claims to have hacked Reddit, threatens to leak data”