[mt76] MT7615 + airtime fairness: Does it work?

Hello,

I found a screenshot about airtime fairness:
grafik

Does anyone know or has anyone actually tested if the mt76 driver for Mediatek MT7615(N) actually works like this? Also, is there any limit for working airtime fairness regarding the maximum amount of connected devices, i.e. airtime fairness works for 10 connected clients but not for 100?

Regards