As the table shows, the Delta variant is one of the least lethal variants of all. In fact, of all the variants, the only ones with case fatality rates that exceed a single percent are the Alpha, Beta, Eta and Zeta variants. The case fatality rate of the Delta variant is a piddling 0.3%.
You'll also note how, of all the variants, the Delta case count is inflated with a disproportionately large number of "probable" (unconfirmed) cases ascertained via genotyping. Of these cases, the UK Government describes them as "Probable (genotyping) COVID-19 confirmed case [by PCR] with a genotyping result where sequencing confirmation is awaited or not available. " It remains to be seen whether future reports confirm these cases as Delta infections.
It bears reiterating that these figures are case fatality rates (CFR), not infection fatality rates (IFR). The former will always be much higher than the latter, because CFR represents only the cases that are serious enough to require medical attention. IFR refers to the death rate among everyone that is infected, including asymptomatic people.
As such, the true fatality rate of all these variants is truly miniscule and measured in fractions of a percent.