Welcome and I’m sorry for the circumstances that has brought you here. I hope he is found soon.
The info I posted that stated he was last seen swimming is information gathered from verified media links (news articles).
We (members) can only post info that has been shared from sources like main stream media and law enforcement. I am unsure the media’s source that shared with them that Nathan was last seen swimming. Unfortunately, at this time it is all we have to go by.
Once your verified, then hopefully if there is any misinformation, it can be cleared up.