Do you still endorse that argument as worth making, after this hypothesis about motive behind using it and its vacuousness was pointed out?

No. Thanks for being patient and clearing that up for me.

To sum up, it seems that due to (perhaps unconscious) motivated cognition I failed in at least two ways:

• I didn't initially examine the purpose of my comment closely.
• I didn't spot the vacuousness of my comment upon reflection before posting.