Several people who are bitterly contesting this discussion with OP, are clearly displaying they haven't even understood the thread topic properly. READ before regurgitation of stock responses, is a good advice for these.
1) The thread states, simply, that Novak has dominated Rafa more on hard than Rafa has dominated him on clay. It specifically refers to their h2h on surfaces as a whole, not only on slams. How can you contest this based on the numbers? The h2h actually speaks for itself.
2) HOWEVER, considering only slams, it is true that Rafa, thus far, has been more dominant on clay than Novak is on hard. He has won 77% of their meetings at RG, while Novak has won 60% of their meetings on hard court slams. But I think, given a few more matches to come, this number would very well change. Let's not so conveniently forget that Rafa has not beaten Novak at a hc slam (nor on grass either), since 2013.
I would add here, that one thing also needs to be understood. Novak has been good enough on clay to reach latter rounds and play Rafa 9 times at RG. Not intending this as a knock on Rafa, who is my 2nd fave champ, but he has not been good enough consistently on hc slams to reach far enough to meet Novak-- they have met 5 times in total. Not since 2013! at the USO, and not between 2012 to 2019 at the AO. You can hardly fault Novak for Rafa not progressing to meet him at the AO all these years, while he was keeping his end of the deal and meeting Rafa at RG, no?