He would clearly be speaking in Spanish so I wouldn't be surprised if he said faster courts or hardcourts rather than "super fast". The main point I guess is that more of the circuit is on surfaces that favour Fed - hard courts & a bit of grass - than those that favour Nadal - clay. Doesn't take away from why Federer is better than Nadal but it's just something that's a fact - there are 2 slams on hard court and only 1 on clay.
Really Federer fans should be happy with Toni - he's always saying how great Federer is and that the debate is only between him and Laver, not him and Nadal. Also both him and Nadal have always said they don't think much of the H2H situation.
I like the way in the same paragraph he celebrates history of tennis with Laver and says that tennis nowadays is mostly run on fast courts
"Fedfans should be happy with Toni" ? no I'm happier with Rafael who has been more honest than Toni in recent years, as when he said in his book "against Fed, I know what I have to do, I only have to bring the ball back on court and play to his backhand, I'm much more scared by Djokovic and I had been since Djokovic emerged on Tour" ... and Toni is the manager who advices Rafael in those things, then he clearly thinks the same (I even think Rafa says that the long-term concern about Djokovic had been shared with Toni). From everything I heard, and he shows it again when he says that the idea against Fed was always to slow down the game, Toni is the strategist in the team, he thinks a lot taking some ideas sometimes from original origins.
As for the praising for Fed, you know Toni has always used the strategy of making his nephew "scared" of his opponents, and it has worked so well against Fed, why would he change ?
What Toni says will do very little for Fed's reputation but what Toni has made as Nadal's manager has done much more against that reputation.