I’m sure it violates other professional conduct rules, but at the very least, intentionally misleading a client or omitting information would likely be considered a lack of competence.
A lawyer shall provide competent representation to a client. Competent representation requires the legal knowledge, skill, thoroughness and preparation reasonably necessary for the representation.
That’s how you get disbarred for misconduct.
I’m sure it violates other professional conduct rules, but at the very least, intentionally misleading a client or omitting information would likely be considered a lack of competence.