It links to the actual paper if you are interested, the paper has a whole table of covariates it took into consideration. https://content.iospress.com/articles/journal-of-alzheimers-...

I don't think the paper or the journal article suggested it was causal either. But such a correlation with such a large population warrants publication and further research into causation.

You unfortunately chose literally the first thing that any epidemiologist would consider, which is considering potential confounders. Maybe read up a bit before commenting.