'Arms dealer': one who sells arms. The point he is making is that, regardless of what is considered legitimate, both this individual and the U.S. government are, by definition, arms dealers.
Agree, US is not a "dealer" they're an "exporter" -- and no one selling weapons for a government would ever offically refer to themselves as an arms dealer.
> the US makes a massive amount of cash selling weapons
DOES NOT COMPUTE