Describe the topology. A lot of people say "I'm wired in" when they actually mean "I am plugged into a powerline extender and forgot about it"
Its just a droid box wired with an Ethernet cable directly into the router in the same room, and a games PC upstairs which is connected directly to the router downstairs via an Ethernet cable through the ceiling.
He doesn’t have any power over Ethernet devices and besides he’s tried the WiFi of his iPhone 11 and that gives same low results, as I said my iPhone XR gives me over 600 mbit/s when standing next to router.
We both have Netgear Nighthawk routers mines the AC1900 one his is AC1750 I believe, it’s the one that’s one below the AC1900 anyway.