I’m afraid what’s happening here is what’s called “confirmation bias”.

Here [1] it’s actually the author who rules that out himself based on prior knowledge and the fact that the situation didn’t get better after the first diagnosis and subsequent treatment. Looking for a secondary cause/explanation is what drives him to ask the question in the first place. GPT says here are some “general information on…”.

[1] https://twitter.com/peakcooper/status/1639716836911489025?s=...