Time periods kinda messes up these analyses because statistics is hard for a lot of people.
"Second, while risk over time is important, people are primarily concerned about the risk of getting infected with SARS- CoV-2 right now, not, for example, over the last 3 months."
The authors just kinda brush this aside. Their analyses are focused on singular events such as social gatherings, going to work, transportation, etc. Incase I'm not getting my point across, this is REALLY, REALLY STUPID, and I'd be embarrassed to publish this kind of analysis..
They also focus solely on the psychological harm of exclusion of unvaccinated people (very real consequences of serious mental and economic impacts to these people). Not actual harm of adverse reactions to the vaccines (effectively 0 actual harm), but make comparisons to drugs with considerably more side effects.
Not considering cumulative effects of even a single week on transmissibility radically skews their analysis. We don't do this in health and safety when death is on the line for a reason...
To put this another way, their analysis compares statins, a drug used to combat a constant exposure to heart-attack and stroke risk (from cholesterol), to a 1-8 hour singular event of exposure of unvaccinated people who may or may not have CoViD.
No Doctor I know would prescribe statins if you only had risk of heart-attack or stroke for a 1-8 hour event on a single day.