Mojang has no control if Steve gets in or not. It really means nothing. If they don't want to treat him like trash, it's whatever. It's pretty dumb to do so, since it's an important icon to the company, but all it does at best is make the company look childish.
It might be more telling if Microsoft said something, though, since they own the character. If Mojang went out of their way to make it clear Steve wasn't in, which would mean they aren't an NDA, it would matter, though. But they have not said anything close to that. Just they dislike the idea, which again, is an opinion they are allowed to have(whether it being a healthy way to act or not).