Because rel@tionship status is intertwined with another person, I think it is at least a little bit rude to change it in the manner that he did (i.e. they are not actually divorced). I think it's fine to change it if a hard line has been crossed in a the rel@tionship (officially engaged/officially married/officially divorced). It gets a little more complicated when rel@tionship endings are more subjective (are we really broken up? was it just a fight? etc.) Using rel@tionship status to make a statement is inconsiderate, and therefore rude. It seems like he changed his status due to being frustrated/angry/etc about the counseling not going well rather than because he is actually single at this point. It's airing your dirty laundry rather than announcing a life change, if that makes any sense.
When my husband joined facebook last month, he listed his relationship as "it's complicated;" I was aghast and immediately requested that he either change it to "married," leave it blank, or hide it from view. He complied with my request. My status is still "married" because I technically am. I do not plan on changing it until there is a divorce, because all of my acquaintances do not need to be involved in my hemming and hawing and relationship drama.