https://www.thelancet.com/journals/lanpub/article/PIIS2468-2...
I may be reading it wrong, but when I look at chart "Table Characteristics stratified by having ever received any influenza vaccination" the Never received influenza vaccine group has much less diseases - Atrial fibrillation 0.67% vs vaxxed 2.12%, Chronic obstructive pulmonary disease 1.52% vs vaxxed 4.1% and so on and then we reach "Any stroke event" 0.52% vs vaxxed 1.25% while not that much hiugher average age 48.34 vs 38.98 (unvaxxed).
So even if they suposedly lower the risks within the vaxxed group, by joining the vaxxed group your risk actually grows compared to staying in unvaxxed group and I don't really see odds for both comparable groups.
> Due to the nature of this research using administrative data across a population, participants of this study did not agree for their data to be shared publicly, so supporting data are not available.
I would take any study coming from authoritarian Canada, which froze bank accounts of people opposing COVID lockdowns, with big grain of salt.
Also even according CDC flu vaccine efficacy is only 40 to 60% and that's assuming it works at all, if they don't match the correct variant you are somewhere around 0% efficacy, might as well take placebo with same effect.