Firstly, Kwock Jan Fat v. White, 253 U.S. 454 (1920)
This was a ninth circuit case reversed by the Supreme Court.
From your post:
But, while it is conceded that he is certainly the same person who, upon full investigation, was found, in March, 1915, by the then Commissioner of Immigration, to be a natural born American citizen…"
Now let's take a look at the full text without the chopped sentence:
But, while it is conceded that he is certainly the same person who, upon full investigation, was found, in March, 1915, by the then Commissioner of Immigration, to be a natural born American citizen, the claim is that that Commissioner was deceived, and that petitioner is really Lew Suey Chong, who was admitted to this country in 1909 as a son of a Chinese merchant, Lew Wing Tong, of Oakland, California.
Context can be everything.