I think this is an important distinction because it leaves the door open to the possibility that: 1) the professor voluntarily stepped down 2) the professor will return after the semester is over 3) the professor is being paid during this leave and will suffer no real professional consequences.
In other words, there's a real possibility that the Dean had the following conversation with the professor: "Hey, I know this wasn't intentional on your part, but this is quickly becoming a PR nightmare and I'd like to nip it in the bud. Would you mind stepping down from your post for just this semester until this dies down and I can get a handle on it? This will make everyone's life easier & you'll still get paid anyways."
In this light, there's less reason to be outraged at the Dean.