No, not just weeding out due to Covid.
If that was the case, you won't see death rates decrease across multiple groups and not just the weakest groups.
> Death rates declined across all racial and ethnic groups, and in both men and women.
https://www.medpagetoday.com/publichealthpolicy/publichealth...
> It's the result of not only the dissipation of the COVID-19 pandemicopens in a new tab or window, but also waning death rates from all the nation's top killers, including heart disease, cancer, and drug overdoses.
GLP1 theory of everything
I think it would depend on how the “weakest groups” are decided. If the weakest 10% of 2021 all died, then the weakest 10% of 2022 will be people who were stronger than 2021’s weakest 10%. All the groups would propagate up to be stronger than in previous years. Now i don’t know how these groups are drawn, percentiles is just what makes intuitive sense to me.
The linked quotes don’t seem to support your argument, unless I misunderstand? If the weakest people die, then the remaining people are expected to be more resilient to heart disease and cancer.
I think decreases in drug overdose and suicide are probably the most isolated from this effect, so I have higher confidence that those decreases are “real”. But I can imagine ways that even they might interact.