Perfect. Thank you for confirming my suspicions and for helping understand the hop 1 PL. I did what you suggested and pinged my router for a few minutes (long enough that several lag spikes would have shown up), and I saw no packet loss. I should be able to convince Xfinity with this data.

Also, I think I will swap the Eero out for the XR500 from my brother-in-law. The latency in game is pretty similar, but I feel like the Nighthawk was a bit more consistent before all this happened. Thanks again.