Is is true, but, as I said before, the risk is fairly minimal. I've been warned about the dangers of rice in food hygiene training, but I can honeatly say that I've never personally known anyone who has been poisoned by rice. However, because I'm aware of the dangers of food poisoning, I'm careful about it and I certainly wouldn't serve cold or reheated rice to anyone.
I would imagine that sushi is made slighly safer because of the vinegar added to the rice, and also because any decent sushi place would be subject to some of the most stringent food hygiene regulations, partly because of the rice but mainly because they are preparing and serving raw fish. If the sushi is properly chilled and prepared, and not left out of proper refrigeration for too long, then it won't do you any harm at all.
As for the Chinese fried rice, yes that's how it's made. As I've said, if the rice has been properly stored and is reheated properly, then there's no reason why you should get ill. However, takeaways are notorious for generally having very poor standards of food hygiene (there was a recent FSA report highlighting this) and so, personally, unless I knew the place was clean I wouldn't risk eating reheated rice from one.
However, like I've said bacillus cereus poisoning is NOT one of the most common forms of food poisoning. There are parts of the world where rice is a staple of the diet and they all seem to be staying alive lol. The truth is that if you don't prepare and store food properly, you risk getting food poisoning, so it's always worth storing cooled food in the fridge as soon as you can and keeping you kitchen reasonably clean. Getting poisoned by rice isn't *that* likely at all, so it's not something to worry about on a day-to-day level. However, cooked rice is classed as a high risk food so it's up to you whether you want to eat it the day after.