I'm not telling that you're not right, phew is a good word to express your relief, but it's like, for example when someone comes into your room and you're hiding, he leaves without noticing you, you say 'phew'. But literary it means "fúj" as well.
I'm sure, that here it was used for something like Wow, or nice, which of course has quite different meanings. Spoken english is pretty much different, but words have quite a lot meanings.
Hence I don't use phew to express my disgust. I'm just trying to say, that phew has more meanings than just an exclamation of relief. It depends on the situation where you use it. Anyway, the way Senki used it was wrong, but still, in different situations it can mean different things.
That's it.
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