Thanks for being skeptical, looked it up because of that. Looks like the primary study people cite is this one, which indicates around 65% of people filing for bankruptcy cite a medical contributor of their bankruptcy. That includes medical bills (highest contributor overall) and loss of income due to medical issues.

https://pmc.ncbi.nlm.nih.gov/articles/PMC6366487/

I’d like to see what information you have that’s different though.