They have incurred a lot of reputational damage by selling people lemons. Their whole model is based on getting stock in at prices under market value from people desperate to sell, or too lazy or unable to drive around to multiple dealerships to get the best price on a trade in.
Those desperate to sell were either in financial distress - or had a car with issues they could not get rid of otherwise.
So if you buy from them you don't know which of the above you are getting - so they added the Dekra report as a way of trying to make the possible lemons visible - problem is they never marketed it like that and individual sales people still kept quite when an unsuspecting buyer thought they were being clever by buying a car under retail value from them. And the Dekra reports were way wrong in some cases anyway.
What they should do is find a way to give customers the same sense of security they would get from buying a new Chinese car.
A new car might have issues, but at least the customer knows that there is a warranty in place and recourse should it be a complete dud.
Not quite. It's pretty common knowledge that if you don't want to sell privately, WBC's is a very good option for top price compared to a trade-in.