In terms of the story the patient posted, she has posted MRI pictures of her brain (with her personal information) that tracked with an skull base tumor (according to a quick look by an oncologist, who told me I should really ask a radiologist.) (Which is the epistemic hedging that the article metnions.)
I was also able to verify that of the case numbers she mentions in one of her posts exist and were filed in within the timeline mentioned (late 2025/early 2026), and they've been deemed "non-actionable". (But I couldn't confirm if she was indeed the person that filed them, or if the complaint was indeed against the Greek government.)