Van Damme is an undefeated kickboxer and won some titles before becoming a movie star. Seagal is like a 90th Dan in Aikido, so he's not impersonating shit. Yes, Aikido could be an inefficient martial art (I don't really know because I have never practiced it), but he's not saying he's a world class BJJ black belt/Muay Thai champion/Karate Mastah, so no, TS, he is not a guy without credentials posing as a legendary Martial Artist.
Maybe pretending to be one should be a crime, maybe not, but you know what should really be a crime? Making shitty threads like yours.