DugwayDuke and the rest of the Branch Covidians are going to be upset with you for pointing out the truth.
This study is suspect.
This is the Nov 2021 study that has been the gold standard for comparing recovered immunity to vax.
https://www.cdc.gov/mmwr/volumes/70/wr/mm7044e1.htm
That is not lacking in peer review, in fact it looks like most of the peers are co-authors.
Note that the study in question is outdated now and it is known that NO immunity from any source is very protective after a few months pass. So the urging of vax is outdated.
As for this Qatar study, the only age relevant comment is for >50 yrs old. Their life expectancy at birth is about 76, which is not a horrible skew.
The primary problem is finding such poor protection against infection or re-infection and then declaring the reverse for death. I will spend some time with the total study, but at first glance the primary problem is splashing the initial text with data for the young, who were not at death risk regardless.