Because i dont have 10 gbps subscription yet. So im wondering what yours says in system info - hardware - ethernet. Because mine says max link speed 10 Gb/s so if your’s does too, then clearly my ethernet card is 10 gbps.The screenshot already show internet speed of near 10gbps (theoretically only), so not sure your question on showing if it’s 10gbps hardware.
I can share later when I’m back home but can’t find relevance to your question
Like i said, im sure Apple wouldn’t cheat me but since my 1 gbps contract has another 1.5 years, I wouldn’t be able to get a 10 gbps subscription to test.