windows modify MAC address

I met a MAC-locked network today, and only the corresponding MAC address is allowed to enter the network.

Then, I see what the leader does: the leader asks to modify the MAC address.

Wori. Isn't the MAC address burned in the network card?

Then I Baidu: MAC address is written in the system in the form of key value.
Woj, key value? ? ? ? ? ?
Since it is a key value, it needs administrator privileges to modify it.
In this era, who is not an administrator anymore?

Since it is a key-value method, what is the meaning of MAC lock?

This is a screenshot of my screen. A network card is a device, just modify the MAC address and save it. The key value is refreshed in real time.

I have a problem with the three views.