Earlier quoted context omitted.
I think the issue is he gave expert testimony. So it’s not just speaking about it, but presenting from a position of authority without qualification. I think the whole expert testimony business is suspect as the definition of “expert” varies so much. But I think the correction is in the law specifying what is expect and not and making that better is the place to focus. It seems like the correction would be to invalid…
Being a licensed engineer is not a requirement to being an "expert" in expert testimony. You are an expert if the court deems you an expert and the opposing counsel has agreed. Full stop. I think that the only thing an engineering license should grant you, in this case, is the right to call yourself a licensed engineer, which conveys some degree of authority. I don't think he made that claim.
Of course, both the lawyers and the judge can take both credentials and experience into account when evaluating the credibility of such a report.
Obviously, if someone isn't licensed they can't present themselves as being licensed and various regulatory agencies and the like may require someone to be licensed in order to sign off on various documents.