The part of CRA that allows a retailer to sell goods that have faults is the requirement for the goods to be described accurately.
Provided the the actual faults are defined and described in the advertisement or the official description of the goods the seller can decline to warranty those issues and cannot be held responsible under the CRA as they were declared in the description. Technically even just a verbal declaration of such faults should be sufficient, but its better to have clear documentary evidence.
Sold as seen is not focused enough to define excludable issues.