To provide comfy environment for h pylori development it helps to have GERD which guess what happens due to stress. So h pylori does cause ulcers, but they proliferate if you stress and in a way it's potato, potato. Choose between stress lots and take h pylori meds or, you know, not stress and be unlikely to get ulcers (and lots of other bad stuff!) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7210023/
Just because A increases the possibility of B does not mean B implies that A happened. I had h pylori but no GERD (and my partner has the latter but not the former). I was completely asymptomatic.
That paper you linked to just included h pylori as a passing example of potential endogenous factors and did not make a more substantive claim. Note: I did not check any of the footnotes that mentioned H pylori, which might have done.
If you were asymptomatic, does it count as ulcers? Did you had broken stomach lining and stuff? If not, isn't it exactly what I said: h pylori does not automatically cause ulcers, unless you provide with a comfy environment to thrive by stressing/refluxing
[1] https://www.discovermagazine.com/health/the-doctor-who-drank...