The report is linked in the article. Looks like there was no consideration as to the vaccination status of the subjects. Everyday they are admitting more and more the vaccines can be very hard on the cardiovascular system, how do we know this was “covid” and not the “vaccine” causing these results.
https://www.researchsquare.com/article/rs-940278/v1
“Within 6,239,465 participants who encountered the VHA in 2019, 162,363 participants who had a positive COVID-19 test between March 1, 2020 and January 15, 2021 were selected into the COVID-19 group,”
Looks like this was done mostly pre-vaccine.
The control group gets smaller every day.