It would be true if he said 2+2=4, since that is backed up by every source that happens to teach basic math.
However, here's where your argument fails. That comic exists for the purpose of pushing a political agenda. I am saying that since he believes in racist and antisemitic conspiracies, to the point he pushes these conspiracies in his comics, his credibility is rather low. Very low. So really, any sane person shouldn't have any business believing in a political propaganda comic by a guy who also believes in Holocaust denial, white genocide, etc.