That may be true, particularly since they push for the elderly to get vaccinated, but overall it still wouldn't make that study an overall projection of world outcome. Those multiple comorbidities, when looking at the new study from the Cleveland Clinic, how after the third vaccine one's immune response switches up, something of that nature would also play heavily into people with weaken immune systems and comorbidities.

https://www.science.org/doi/10.1126/sciimmunol.ade2798

In laymen's terms:

https://www.rintrah.nl/the-trainwreck-of-all-trainwrecks-billions-of-people-stuck-with-a-broken-immune-response/