I can discuss a few things
1) I wanna know why we only hear about the Slam H2H for Djokodal. For any other H2H in tennis history, we watch the overall H2H. Except for these 2... Why? Where do we draw the line? Why can't we count the "Majors H2H" adding Olympic Games and WTF? And keep in mind the H2H was 5-0 before Djokovic became Djokovic. Not saying those first 5 matches aren't important, but it does skew it a little bit. It's like saying Medvedev dominates the H2H vs Sinner now, ignoring the fact that Medvedev won the first 6 matches when Sinner was still the rookie version of the player he became in 2023/2024. Oh wait, Djokovic has a losing H2H in Grand Slams against Safin, Grosjean, Coria, Ancic and Goldstein. Does it mean these players are better?
2) 9-7 in complete matches. IMO the ATP website shouldn't count walkovers and withdrawals in the H2H. Counting RG 2006 and Wimbledon 2007 as big significant wins for Nadal is pretty laughable.
3) Clay represents 25% of the Grand Slams. 56% of these 18 Slam matches were in RG. Do the math,....
.IMO, the Slam H2H would only be relevant if they also met 10 times in AO, 10 times in Wimbledon and 10 times in USO. When you have 10 matches in Nadal's pet Slam and only 2 matches in Djokovic's, does a 9-7 H2H really show anything significant?