I think it's true. Kohlschreiber has one of the best 1hbh on the planet and opted to hit moonballs back to Tsonga.
Obviously Nadal's heavy topspin is going to be an issue for most but Gasquet does a good job of it and he stands back waiting for it to drop. I have seen Gasquet do a jumping 1hbh once and I don't know if that could ever be done consistently. It was sort of like Nalby's jumping two hander.
Tsonga shows his 1hbh in this vid. Knowing both could be a new trend and maybe one-handers should also learn the two-hander nowadays. It's nice to have options.