A lawyer, by proffession, lies in open court. Either knowingly or knowing it may well be lies.
That is illegal. A lawyer is not allowed to lie in open or closed court. And usually does not claim anything to be true or not true, in any event.
And it is also illegal to allow a witness to testify if you know it is lies.
You agree a frum lawyer should not engage in any of the examples I cited?
I think you don’t understand what lawyers do, and that is why your examples are not on point.