They don’t seem to give overall preference to a given supplier beyond their obvious coupons and paid rankings. Alibaba is better, but who needs 144 of any specific widget…?
If you compare to one of the most preferred e-commerce website, which I would consider Amazon, it’s still not that bad. I have found less lies on Ali express v Amazon. If it comes to any cheaper electronics the Ali description is the real deal as far as I have seen. Amazon I have been shipped differing products, the description or features have just been a lie, or it didn’t come with the things implied. For the most part Ali descriptions are exactly what you will expect when opening the product… in fact many times I discover extra features when receiving the product that seemingly just couldn’t explain in their marketing.