The phone was not unfolded. If it was a foldable one, it could have been any of the current ones in the market. The guy suspiciously holds it in such a way as to hide the thickness. So it could have been a setup with the help of a friend so this author could have something to write about a Pixel foldable phone.
Purportedly, some Google employees are already in possession of Pixel Fold units. One has even been spotted on a New York subway train with Google's first foldable smartphone, which may launch before the Pixel 8 and Pixel 8 Pro.