The Celtics are not going to be cutting anyone to sign someone else. If they do they exceed the tax line and become repeat offenders. So this is nothing more than rumor mongering on Washburn's part to sell ad space, get web hits and sell newspapers.
I expect trades from the C's that will be even financially or that will cut salary, but this team is in no way, shape or form going to go over that luxury tax line this year. Not under any circumstances.