It's hard to tell whether the attorney represents a plaintiff or is the plaintiff.
In either event, you can bring the error to attention of the court, assuming you move in a timely manner.
The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
Since I don't know the substance of the dispute it's hard to advise you. However there's often information that is slightly off or even wrong in such declarations. I think it far better to prove him wrong than to waste time trying to convince a DA to prosecute him for perjury.