Where is SLB-EXT tech docs?

It seems difficult to find the tech docs for the SLB-EXT. When clicking on the “help and resources” link on this page SLB-EXT Closed-Loop Controller | Sienci Labs it goes to the regular SLB document. Where is the doc for the SLB-EXT?

@DavidB They are linked from the Altmill resources. I agree that some documents are hard to find and not where you would necessarily look for them.