The tutorial which you mentioned above is written for Minimal ADB and Fastboot and not for plattform tools. Since this tool is only available for Windows, you have to use the original Android SDK Platform-Tools. The procedure should be more or less the same, although the place where you can put the plattform-tools folder might differ. And the command line tool on macOS is - of course - also a different one 
I’m still planning to expand the tutorial for plattform-tools and thus for other operating systems like Linux and macOS…