Read the quote on DxO's web page:
"Here is a sample of some of our clients."
It doesn't say that those listed are DxO's only customers. It also doesn't say those listed are the top ten DSC manufacturers. It just says that they are *some* of DxO's customers. So Canon could well be a customer of DxO and if they were, then the statement on DxO's webpage is still true.
This is sooo sad...