It's no longer Covid, a cause disproportionately among white Americans during the pandemic as a likely result of conservative resistance to vaccines and masking. The continuing decline is mostly among people of color and with white Americans suffering from obesity and other poor health styles.
https://www.washingtonpost.com/opinions/2023/06/01/american-life-expectancy-decline-covid/
https://www.washingtonpost.com/opinions/2023/06/01/american-life-expectancy-decline-covid/