The quote is just a statement of an alternative.

Some properties are: related, positioning, box model, etc. Knowing this is part of understanding the browser. And understating the browser is necessary to write css. It should be. And knowing that the proposed order just comes naturally.

Alphabetical order is just an comfortable way to do things.

If you can't look at it this way maybe you can look at it like an experiment, everyone agrees to try it this way in the next projects. In the end we can analyse the results.