It probably wasn't cut. It just probably wasn't recorded. Whoever was watching and capturing the stream probably didn't fully realize what was going on at first. And if they didn't know about screen recording they may have had to do a Google search and figure it out, by that time he was gone.
Though it does seem a more appropriate thread title would be "Old man already dead for a while after cam show, wife and EMS find him".
I kept the same title that the original post had on Reddit.