There needs to be somewhat a seperation between Seagal's movie aikido and his true life aikido. I remember going to Exit Wounds and saying, "wait, that's not aikido!" But nowhere in the movie did he claim that his character was an aikidoka. Much like those who believe that since he played a brilliant mathematician in "A Beautiful Mind" Russell Crow must be some kind of math genius.
Steven Seagal doesn't make movies to be the "aikido rolemodel". No one criticizes other action stars from straying from their path in a film. Seperate character and person.