That's not what he said and you know it.
Saying those are FEATURES of Gsync, whilst technically not incorrect (as the board features that functionality) is like saying DVI out is a feature of GeForce graphics cards.
I never said they were features of Gsync, i said they were features of the gsync module.
Funny you should mention ports, as Nvidia cards have hdmi 2.0 where as AMD cards have DP1.2a, so yes I would say what ports are supported are a feature of that product.
In the case of monitor scalers, yes some support some ports that others don't, so yes again I would say DP1.2a or Hdmi 2.0 would be "features" not only of the monitor as a whole, but also of the main control chip they use, be that a Realtek scaler or an nvidia fpga based gsync module.
Melmac is saying that the features the monitor supports are completely independent of what control chip it uses, but that is like saying "my computer supports gsync" but refusing to accept that your computer supports gsync because it has an nvidia gpu.