This repo contains the installation guide and EFI files required to get a perfectly functional Catalina and Big Sur hackintosh on your Brodwell (5th gen) T450 or T450s. Everything is stable and functional as described in the Readme.
Why do you think that https://github.com/acidanthera/VoodooPS2 is a good alternative to Lenovo-Thinkpad-T450-T450s-Hackintosh-Guide-Opencore