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I want this to convey a sense of denial
I would probably say 「あいつ、"死にそう／かけてる"とか、それほど"ヤバい／ヒドい"ってわけじゃないでしょう?」.
彼は別に死にかけて（い）るわけでもないし or maybe instead of the last し something like でしょう or some more colloquial form.
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