I maintained the site with Steve@realcycles providing the hosting.
Steve dropped Commencal after Madison stopped distributing them a few years ago(somewhere around 2011 IIRC), so it was going to be killed of at some point, as Steve’s main benefit from running it was for sales.
After Madison, Commencal went to Decade Europe (part of CRC), but have since gone the direct sales route ala YT/Canyon. The main benefit from this is they seem to be more responsive to direct enquiries.
As for the QR/bolt through/maxle question, it’s all down the dropouts.
Depending on the model/year, those with a QR (10mm) option, would likely of had either 12mm bolt-through or Maxle dropouts available.
I think most of the dropouts are shown on the commencal website, so you can see what’s available for your frame.