I'd agree with that one... using sphag along with LECA, even if you keep it sort of divided (like sphag along the perimeter of pot and LECA in the middle, would end up needing repotting way more rapidly. When I first read about this, all I could think was what a yucky mess that would be a year down the line. Sort of ruins the idea of not having to repot often.
...which is why I've started using rockwool cubes, instead