Not the way I read it. If you plan to launch every six weeks, you may well end up with one unit on a launch pad being assembled, refurbished or upgraded while another is being launched. Be nice to have a place for that one to land. Remember that these things are BIG (and getting bigger) and that transporting them to a launch site is a non-trivial problem. If you land them at the launch site, you don't have to spend time and a lot of money moving them to the site later. OTOH, I have no idea what the constraints are on "Return To Base" for these things.
The downside is, of course, that if anything goes wrong with the launch or landing, you're potentially down two or even three launchers instead of just one.