If you search the paragraph quite a few sources will come up in your search. Here is one:

https://ussanews.com/massive-145-country-study-shows-sharp-increase-of-transmission-and-death-after-introduction-of-covid-vaccines/

Was so pissed off at that sentence I completely forgot to put the link:

https://www.researchgate.net/publication/356248984_Worldwide_Bayesian_Causal_Impact_Analysis_of_Vaccine_Administration_on_Deaths_and_Cases_Associated_with_COVID-19_A_BigData_Analysis_of_145_Countries

The effect of vaccines on total cases per million and its low positive association with total vaccinations per hundred signifies a limited impact of vaccines on lowering COVID-19 associated cases.

if that counterargument were true, we would expect to see countries with higher vaccination rates also have lower (or negative) impacts from vaccine administration on rates of cases and deaths associated with COVID-19. Instead, we see the opposite, a low positive correlation (ρ: 0.34, p < 0.001 ) between total vaccinations per hundred and the impact of vaccine administration on cases associated with COVID-19. These results concur with the fact that the vaccines only offer a low absolute risk reduction (ARR) (0.8-1.9%) (Olliaro, Torreele, and Vaillant 2021) in the first place and have been shown to wane over time to an even lower ARR (Levin et al. 2021; Chemaitelly et al. 2021; Wang et al. 2021).

by late spring of 2021 in the Northern Hemisphere, which is why many of their trend lines go flat for a time. Unfortunately, once the vaccine administration started for the general population, or shortly thereafter, those trend lines began to increase again in many countries, and unnaturally so in the middle or towards the end of summer in the Northern hemisphere or in countries where previously there had been very few if any cases or deaths. Normally, seasonal die off from pneumonia, influenza, or COVID-19 is in the winter, so this spike that appears in many countries after vaccine administration at this time of the year or in countries with no previous outbreaks is highly suspect as not being a natural trend, but rather vaccine-induced.

these results suggest that COVID-19 vaccine administration as a public policy over 80% of the time does not have a statistically significant causal impact of lowering total deaths or cases per million,

vaccine mandates under these conditions and results are beyond unethical at this point, they are clearly discriminatory and likely criminal,

and

Consequently, these experimental gene therapy injections known as COVID-19 vaccines cannot be mandated by any public policy that intends to continue following the regulations of the Nuremberg Code (Code 1998), the Helsinki Accords (Association and others 2009), and the Human Rights Declaration on Bioethics (UNESCO 2019).