Never said there was no bending load. Just not much compared to all the other loads going into the arm. Also, those 7/8" bars have longer arms then the rear mounted 3/4" bars. Pretty much the same load at the LCA for either bar. The 7/8" bar with 14" arms generates about 150.5 lbs per 5 degree of twist and the 3/4" bar with 12" arms generates about 150 lbs per 5 degrees of twist.
And I've repaired four of those old style AZC arms. They would have failed in that exact spot even if there was zero bending load on the arm. Poor design, material selection, prep, and welding. Three of the four arms I worked on were ERW tubing.