Lets put it this way, AMFIPass is not directly related to OCLP patching for Wi-Fi. I only suggested it so you don't need to use -amfipassbeta boot-arg with the updated version of AMFIPass 1.4.0
IOSkywalk.kext is not something you install. You inject it via bootloader and that will be that. It won't make any difference whether you had it injected prior to updating or not.
Again, have you applied OCLP's Modern Wireless patch after you installed 14.4?
Just out of curiosity, I tried the EFI you posted above on my system and the Brcm wifi on my end works just fine. If you are unsure of how to apply OCLP patches, you should start by reading post #1 of this thread. Good Luck!
Hint. You should apply the OCLP wifi patch but not revert the patch.