This ability to defeat the UHD encryption scheme is called LibreDrive. Once it is done, you don't need to mess with it again. Getting the right firmware on your drive is a one-time step. Also, just in the last few weeks, there are some Pioneer drives that have been made to work with MakeMKV that can rip UHDs and do not require flashing a specific firmware they work with the stock firmware. There are sellers that will either sell you an automated flasher that'll help you flash your drive or sell you a new, tested drive that has been flashed appropriately. Once your drive has the right firmware, then MakeMKV can defeat the encryption scheme on the UHD and rip it just like a regular blu-ray.

The thread you found, Ultimate UHD Drives Flashing Guide, lists all the known optical drives that work, lists the firmware levels that work, has links to where you can download the firmware, and lists instructions on how to flash the firmware (on your Mac, it is a command line thing). 4k UHDs, however, are tricky because they have a more complicated encryption scheme. MakeMKV can make just about any modern blu-ray reader work for regular blu-rays. FIRMWARE WAS CHANGED ENABLING LIBREDRIVE SO THAT YOU CAN RIP UHD DISCS USING MAKEMKV. Like AngryVirginian said, you need the right firmware. THE DRIVE IS NEW AND FULLY TESTED TO WORK WITH TRIPLE LAYER UHD DISCS.

Makemkv 4k blu ray