In other words, Delta is literally the flu with a CFR identical to it. This is exactly what every respiratory pandemic has done through history: morphed into more transmissible and less virulent form that forces the other mutations out since you get that one. Nothing about masks, lockdowns, or experimental shots did this. To the extent this really is more transmissible, it’s going to be less deadly, as is the case with the common cold. To the extent that there are areas below the herd immunity threshold (for example, in Scotland and the northwestern parts of the U.K.) they will likely get the Delta variant (until something else supplants it), but fatalities will continue to go down.
According to the above-mentioned report, the Delta variant represented more than 75% of all cases in the U.K. since mid-May. If it really was that deadly, it should have been wreaking havoc over the past few weeks.
You can see almost a perfect inverse relationship between hospitalization rates throughout April and May plummeting as the Delta variant became the dominant strain of the virus in England. Some areas might see a slight oscillation from time to time as herd immunity fills in, regardless of which variant is floating around. However, the death burden is well below that of a flu season and is no longer an epidemic.
As for vaccines, there is no evidence that somehow they provide better protection than prior infection from any other strain of the virus, nor does the Delta variant justify further use of these experimental shots. If anything, the U.K. data show that, to the extent there were deaths due to the Delta variant, there were more fatalities among those already vaccinated relative to the number of confirmed cases by vaccination status.