Words like 'I' and 'you' don't mean as much to Steve as they do to most people. The idea of subjective reality is very hard to understand. I haven't grasped it entirely, but I've disbelieved in ego identity since the age of five, so I guess it makes more sense to me.
As far as Solipsism goes, there isn't necessarily a huge difference. Subjective reality might could be considered an advancement of Solipsism. However, Solipsism is generally ego-based.