The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
When you hyperventilate, of course, you are inhaling more than usual, but you are also exhaling more than usual. So you're, of course, bringing in more air and oxygen to your body. But you're also removing more carbon dioxide from your body than normal.
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So the way I just described all that-- inhale, bring in oxygen, exhale, expel carbon dioxide-- pretty straightforward, right? Indeed, it is. And it also tells you that were you to exhale a lot more or a lot more vigorously, you would expel more carbon dioxide. And in fact, that's exactly the way it works.
So hyperventilation, yes, brings in more oxygen, also removes more carbon dioxide. The removal of excess carbon dioxide puts you into a state that's called hypocapnic, hypoxia. Hypoxia is reduced levels of oxygen relative to normal. Hypocapnia is reduced levels of carbon dioxide relative to normal.