If you sort of think backwards, starting from the assumption that the article's conclusion is correct, it implies that comorbidity complications have decreased

If you sort of think backwards, starting from the assumption that the article's conclusion is correct, it implies that comorbidity complications have decreased compared to previous waves. That could be a case of the authors covarying away an effect, but it could mean some comorbid conditions have declined in the pandemic in the study population. It might also mean treatment of the comorbidities has improved (?)