[Question] Tried to make maple cream/maple butter, and failed miserably... any idea why?

I was trying to make maple cream, and I followed this video's recipe exactly https://www.youtube.com/watch?v=dMXtqslHd_0. Does anyone know why someone might fail? I literally ended up with just barely under 3 cups of maple syrup (presumably because some of it remained in each container for each step). No thicker or anything

bon appetit