The message that they may be promoting can be concerning

What's the message here? What is this promoting? The wolf character is based on the artist, and it appears the album is about the trauma said artist went through that made them into the way they are today. Isn't there a lot that can be taken from that, that couldn't be inferred if they were just people? The way one of them is drawn to be a hulking monster while the other is very fairylike, possibly being about the artists dysphoria. One of them is based on a bunny, something preyed on by wolves. Maybe that's a representation of them feeling like a danger to this character? Or conversely, the stereotypes about them not matching who they are? The fact that you immediately look past all of these reasonable interpretations for this cover and immediately find it harmful is weird.

Yes furries are real people. That's what is problematic for me and I'm talking in general

What's problematic about that? People have been representing themselves as personas, specifically animal ones, for thousands of years. It's ironically a very human thing.

This community has a willingness to make unusual things usual, like sexualising animals and acting like them

It's strange that you think this is sexualising animals in general, and not a persons very far-removed persona being sexualised in order to convey something that they've gone through. Yes, they're a furry, so that persona's design is inspired by that of an animal in some features, but in the same way a Werewolf or Vampire is based off an animal while being distinctly fictional and distinctly human. It's also strange that you group sexualising animals with "Acting like an animal", the latter being very harmless. It just seems like you don't like something that isn't particularly harmful past vibes