No, he wasn't. He was a nonresident alien. You'd have that idiot who stole a plane in Canada and headed into the US last year being somehow able to transmit US citizenship to his offspring because he was arrested in the United States. That is clearly not the meaning of "subject to the jurisdiction thereof." The 14th dealt with extending the rights and obigations of citizenship to a group of people who had been denied such, former slaves. It had no bearing, and cannot have any bearing, upon the meaning of the Constitutional term "natural-born citizen," let alone the eligibility requirements for the office of President.
There was once a kid born in San Francisco to parents who were arguably subjects of the Chinese emperor. Although they hadn't stolen any airplane (planes not yet having been invented), they were definitely here illegally, and they thumbed their nose at the Chinese Exclusion Act.
When the kid returned from a visit to the Old Country, the San Francisco Collector of Customs denied him entry. No doubt, he would have found your argument compelling. However, when the dust settled, the kid had the last laugh, 6 to 2. See Wong Kim Ark.