I don't consider it surprising that a Taiwanese would use characteristically un-Taiwanese expressions on an English-language forum. I'm not sure what to think of your approach of suggesting that they are lying, but then self-congratulating your charity for not outright saying that.

While rice and noodles may be staples of Taiwanese food, that doesn't mean that everyone is eating healthy. In the West, you might say the same about wheat flour and potatoes, but when that flour comes in the form of burger buns and cake, and the potatoes in greasy fries, it doesn't seem so healthy.

I don't know how often Taiwanese drink sugary drinks or eat sweets in addition to their meals, nor do I know how much of that rice and those noodles are fried as chow fan or chow mein (and apologies if those are not the words Taiwanese would use), but it isn't hard to imagine that it is more than optimal. That's usually what happens when people are able to afford more food than they actually need, and are able to choose tasty high-calorie high-fat meals whenever they feel like it.