Hello. You did not show the text to which this question refers, which makes it impossible for an answer to be accurately formulated.
However, since you quoted a lawyer in the question, we can say that he used a formal language, which is the one required in the legal work environment to which the lawyer fits. In addition, it is likely that the lawyer has, in fact, used persuasion resources to reinforce the veracity of the argument he presents, but without the presentation of the text, it is not possible to say which ones.