I wish the author went into a bit more detail about how MSI fixed it, as is usual in write ups like this.
It left me thinking maybe the patch introduced a different vulnerability that’s still under an embargo :)
More likely MSI just being MSI. They're infamous for being far more concerned about image than most vendors so don't expect much info.
Video by GN has a little bit of info (but not a lot). Basically they made it so that the pipes only accept input from MSI signed software + the pipes can only invoke MSI signed executables.
https://youtu.be/Eck8NnoaD4M