He's gotta be trolling about having 19 inch arms.
Do you think he means both arms combined? No, that would take the ability of addition. A concept his mind couldn't comprehend. This could also explain how he thinks he can bench 500.
I've found over the years that if someone's reported max bench ends in *00 or is an increment of 45-lb plates (e.g. 225, 315, 405), they are not only lying but also greatly exaggerating their strength, in almost every case.