Its summary at the end is

""

If I had to assign probabilities purely based on linguistic/structural evidence:

French: ~45%

Other Romance language: ~25%

Eastern European/Slavic: ~15%

Native English speaker: ~15%

But: none of these are strong certainties. The writer is clearly extremely fluent regardless.

""

btw, I do agree you have an incredible command of English in either case, with lots advanced terminology.

-------------------

Edit: I fed it a bunch more of your writing, here's the updated link: https://chatgpt.com/share/691283dd-eb90-8010-97d1-8118eb6152...

and updated conclusions:

""

After the third sample, I would revise the distribution:

French: 35% (down from 45%)

German or Central European (Polish/Czech/Slovak/Hungarian/Russian): 35%

Other Romance (Italian/Spanish/Portuguese): 20%

Native English speaker: 10%

""

I think it has essentially arrived at the same guess I had! I'm not sure how to feel about that, haha, kindof surprised by that result.