Curious to why the Linux+ course isn't up on the Roku for 103/104? There are others in there that are in production, so I thought it was weird.
Roku - Linux+ 103/104
The Roku Channel updates are a labor intensive effort to get them up on the site. These normally will appear but not as quickly as the Website content.
Having said that thought, we are about to roll out a new ROKU channel that should be easier for us and much better end user experience for our members. Be on the lookout for it soon!