I admittedly read the graph wrong, however, you may want to reconsider making libellous statements like this:
Either way Amir should have used that THD+N vs frequency @ 5w test in the Topping review, with the Hypex, Purifi and Benchmark amps overlaid in the background. But that would be poor marketing for his partners at Topping. Which means less commission for Amir from the sales generated by the review.