It looks like IBM has sunset the Knowledge Centers for the former IBM Collaboration products. Searching for something today took me to a page that announced that Domino was no longer supported by IBM and a link to the HCL support site.
So, if you need any help with HCL Collaboration stuff, go to https://help.hcltechsw.com. I’ve been noticing more of their sites showing up in Google searches recently, so we should see that continue to trend and hopefully a removal of the IBM links (not holding my breath on that one).