Please pay attention
In 10.16 (Big Sur) class AirPortBrcm4360 has been completely removed. Using of injector kext with such class name and matched vendor-id:device-id blocks loading of original airport kext. To address this issue and keep compatibility with older systems injectors for AirPortBrcm4360 and AirPortBrcmNIC were removed from main Info.plist file. Instead, the two new kext injectors are deployed in PlugIns folder: AirPortBrcm4360_Injector.kext and AirPortBrcmNIC_Injector.kext. You have to block (or remove) AirPortBrcm4360_Injector.kext in BigSur. In OpenCore you can specify MaxKernel 19.9.9 for AirPortBrcm4360_Injector.kext. In Clover you can have two different AirportBrcmFixup.kext, but in kext folder with version name 10.16 AirportBrcmFixup.kext must not contain AirPortBrcm4360_Injector.kext. You don't need these injectors at all if your vendor-id:device-id is natively supported by AirPortBrcmNIC or AirPortBrcm4360 (your device-id is included into Info.plist in these kexts).