It seems like Topping has a bit of a reputation for shoddy durability. Until Topping publicly acknowledges these issues and resolves them I do not think it is responsible for reviewers and places like ASR to recommend purchasing their products, given that these defects are latent and would not present themselves during a review.
For what it's worth, I bought from Shenzenaudio's ebay account (wsz0304) and got a response this morning. They sounded willing in principle to honour the warranty but wanted some further details. Am waiting for their response and will keep you all updated.