There are so many useful apps that have been created to operate through Docker. It would add a great deal of functionality to the WD lineup of NASs to have Docker as an official app. This would really allow users to find the apps they are most interested in while also letting WD compare itself to other devices such as Synology that have much of what docker offer’s built-in (including docker.)
You’ll see when following the steps that there are files for each model. Simply pick the one matching your model, otherwise the process seems consistent across models. But I’m no expert so if you aren’t comfortable with the redneck guide, don’t follow it.