Of course, Luther knew exactly what he was saying, and so did the others. The angels had been present in Supreme City for so long that many had forgotten that they were created directly by Origin Gods and instead saw them as their 'servants' just because they were tasked with the security of the city.
After all, the angels were not the only non-True God species within Supreme City, so why were they often targeted? This was the problem and terror of perception, emphasized by the history of slavery in reality.
In generation 1, the buyer understands the difference between the seller and the product, distinguishing that one was superior to the other.
In generation 2, his son or daughter has grown up seeing the product but knows about the seller from the buyer in generation 1, so their ability to distinguish exists but is limited to hearsay.