I think you missed out on a point and that is if someone uses Grammarly there's a chance that AI detector would label it as AI created content because Grammarly makes your sentence structure perfect and eliminates grammatical mistakes.

No, I did not miss it. In fact, I mentioned it in the last bullet point in the "Reasons Behind False Positives" section of my post.

It is important, infact very important to go through the entire post manually and not completely rely on these AI detecting sites.

You are right, and that was indeed the very purpose of this post: to create awareness.

we haven't been trained to write in Urdu, specially on a cell phone, have we?

We can write in Urdu, but you know typing in Urdu is very difficult. Moreover, I think formatting your post in Urdu on Steemit is also a big problem. I believe this issue has been discussed before, but I can't remember which post it was.