An educator would have good reason to have an interest in this subject particularly because it is directly related to their job. Professional teachers usually require university-level training in research to be considered qualified for the job are normally given a couple of months away from the classroom each year to engage in this type of research, so it wouldn't have been unexpected if he had said he was an expert. Indeed, it is just as likely that he focuses on other areas of research, but I don't think it is obvious where his work lies like you claim.