How to disable Hyperthreading

For some games, I'd like to disable hyper threading. So far, I learnt that this can be done under OS recovery via a Terminal session by inputting the following lines:

nvram boot-args="cwae=2"

nvram SMTDisable=%01

reboot

However, when the iMac restarts, it still shows under "about my Mac" that hyper threading is still active.

I am using macOS Big Sur v11.6

Is there another way to disable hyperthreading permanently (e.g. no need to disable it at each startup)?

Any advice is highly appreciated.

Thanks in advance very much!

Tilo