Maybe, but it's surprisingly good in the face of all the non-version-indicating complaints about how terrible people think it is. Mostly I doubt that the lawyer was using GPT4, because the lawyer sounds like the kind of person who would be ignorant of the significance of the difference.
The kind of person too lazy to check the output of a computer program before submitting it to a court of law is the type of person too cheap to pay $20 for the good version of the program.