https://www.youtube.com/watch?v=iaRwS6HADf0
I don’t think that the existence of a person, called Jesus, who got crucified is that disputed. It’s the godlike part that’s undocumented (and more important).
Also, times were tough back then. Maybe people saw other suffering and being killed by a sharp object relatively often and that’s how they knew.
I don’t get what’s the big deal in this video.