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> I have seen no evidence that the delta variant was more lethal, but that it was more transmissible

Look here then:

https://www.cmaj.ca/content/193/42/E1619

Increased risk [compared to non-variant-of-concern SARS-COV-2] with the Delta variant was more pronounced at 108% (95% CI 78%–140%) for hospitalization, 235% (95% CI 160%–331%) for ICU admission and 133% (95% CI 54%–231%) for death.

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Alpha falls into the variant of concern classification, and this is contrasting delta with non-VOCs unless I misunderstand.

Just the preceding sentence in the abstract

Compared with non-VOC SARS-CoV-2 strains, the adjusted elevation in risk associated with N501Y-positive variants was 52% (95% confidence interval [CI] 42%–63%) for hospitalization, 89% (95% CI 67%–117%) for ICU admission and 51% (95% CI 30%–78%) for death.

N501Y is alpha

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