My inner physicist wants to scream watching this video... How does a guy have an entire YouTube channel about testing climbing gear, yet doesn't seem to have a real understanding of how force vectors work?
Of course the load on each leg of a 90° triangle adds up to more than 100%! How else could it even have an angle?
And ropes stretch, a lot. The relevant angles are the ones _during_ full load. Not the angles prior to applying the load; ∞ loads are impossible.