The numbers are less impressive then what they seem, and IMO the numbers look like they were computed in a way that resulted in what the authors wanted. For example, weekly counts of cardiac arrest calls are computed using a five-week centered moving-average, and COVID-19 and vaccination doses are computed using a three-week centered moving-average. I'd assume that using three weeks for cardiac arrest calls, the numbers would look less correlated.
https://en.wikipedia.org/wiki/Scientific_Reports
> Scientific Reports is an online peer-reviewed open access scientific mega journal published by Nature Portfolio
https://en.wikipedia.org/wiki/Mega_journal
> A mega journal (also mega-journal and megajournal) is a peer-reviewed academic open access journal designed to be much larger than a traditional journal by exercising low selectivity among accepted articles. It was pioneered by PLOS ONE. This "very lucrative publishing model" was soon emulated by other publishers.
Basically it's bunk-for-hire.
[0] https://en.wikipedia.org/wiki/Scientific_Reports#Controversi...