I'll also add that the pandemic is not the open goal for Starmer people think it is. In times of national crisis the people tend to rally round the government, unless they really obviously balls it up. George W Bush rode his popularity after 9/11 all the way to reelection. Trump enjoyed his highest approval ratings in the early days of covid, before succumbing to the afore-mentioned balls up. Any significant impact has on Johnson's approval will come after the dust has settled and (some of) the truth comes out.