No. But you still haven't broken out your topology. Unfortunately, since I've been relegated to WAGs, hopefully someone else can help you. But as it stands, there's nothing else I can offer, so I'm bowing out.
Can you try the Apple TV over WiFi instead and compare the speedtest results
Ok, no problem thanks for trying. I'm not experienced enough to really understand what your looking for. I will move on, perhaps I'll look at some other alternatives
Sounds like your router might be to blame.
My suggestion would be what @racameron mentioned.
Run an ethernet cable from your tplink archer AC2300 router to an unmanaged gigabit ethernet switch.
Run three ethernet cables from the unmanaged gigabit ethernet switch to each of the following;
switch to M1 Mac mini
switch to 2019 shield pro
switch to ATV
Don't know if anyone has pointed this out yet, but those are REALLY high latency and jitter numbers for a local network. Something, likely at the physical layer, is not healthy. I'd guess a bad ethernet cable or bad switch port somewhere.
I have this problem on Apple TV as well so I tested on my iPhone both in app and via web browser both give different download speeds
Yep, appears either the devs can't reproduce it or don't think it needs fixed.
See Native speed test for tvOS and iOS