Personally, I think most adulterors should be tied to a stake be covered with syrup and then fire ants.
and then have rubbing alcohol poured over them...and then be set on fire. but allowed to live, death is to good for them...again this is for most...I am not that cold hearted
So I don't think asking them to go to a different hall was unreasonable at all. They should have done that before they were reinstated, and I think it would not kill them to stay in a different hall for a few years. Now, asking the couple to leave when they were there to see their kid's talk, no that is definately wrong.
But yes, make them go to another hall. Personally, if it was well know they just figured they would be disfellowship and then apply for reinstatement right away, as if it was a formality, then damn straight, made them go through hoops. Again, I don't know the whole story on the couple, but with the little facts there are here that's my opinion.