We don't have any good proof he was born in the US. What has been put forth is very shaky.
You are correct, but at least that was the strand they pushed as to why he was a US citizen. With Kamelto-a, she was born to foreigners, was raised in Canada mostly. If she makes it in, that means possibly all Chinese babies delivered in the US during the rash of maternal tourism may be next to be running.
He was probably born in Canada. That is where girls went to ‘visit their aunt’ when they had a baby. His father was probably Malcolm X.