paper problems

[ICDI0906]

Hi~ JiaxuanYou. thanks for your great work. Recently i read your paper. But when i read the chapter "Expressive Power of P-GNNs", i don's understand the end in that chapter says that "join distribution of their distances to comman anchers have more expressive power than existing GNNs.",is it conflict with the sentence "Optimizing Equations 4 and 5 gives representations of nodes using joint and marginal distributions over node embeddings, respectively."
I look forward to your reply