The lab here is actually completely missing. When I click on Start Lab, it just spins and spins.
The Start Lab button just launches the video and makes it larger, then the navigation menu on the left disappears.
Were these ever tested once by someone other than the authors?
The link you provided is to a lecture not a lab.
I would have shown the link to the lab, but as the lab is missing, I could only show what should be the previous section for the absent section.
Observing the flow and structure of the content, you can see that there should have been a lab here. Typically they’ll have topical content, then a Demo section followed by a Lab section. In this case, there’s a Demo for a Lab that should be there but is not.
Furthermore, on the Demo page, there’s a “Start Lab” button, further indicating that there is indeed a missing lab component to the Demo slide.
Update. envconsul + consul-template labs were merged into one lab.