In most countries there is also a delay between when people are moved from the "unvaccinated" to "vaccinated" category -- e.g. two weeks post second Pfizer/Mode

In most countries there is also a delay between when people are moved from the "unvaccinated" to "vaccinated" category -- e.g. two weeks post second Pfizer/Moderna dose in the U.S. Those who take only one dose and then do not take the second (for whatever reason) remain in the "unvaccinated" group. It would be interesting to see how this would affect the picture in their model in combination with (or independent from) delayed death reporting.