As SilasX points out, using the phrase "claim of impunity" could also confuse laypeople about what the legal term of art is. But more importantly, no one ever c

As SilasX points out, using the phrase "claim of impunity" could also confuse laypeople about what the legal term of art is. But more importantly, no one ever claimed impunity. You could say they "cannot do x with impunity following this decision" perhaps, but you cannot say that the TSA "claimed impunity" — which they did not ever do.