You’re mistaken. From the article:the numbers you quoted are for symptomatic infection not for hospitalisations
Between 21 June and 19 July, 1,788 people were admitted to hospital after testing positive for Delta. Of these, 54% were unvaccinated while 30% had received both shots. In total, 3,692 people have so far been admitted to hospital with the Delta variant, of whom 2,152 (58%) were unvaccinated and 843 (23%) were fully vaccinated.