I'm glad that I checked out the video, it reminded me of when I was much younger when I paid the occasional visit this type of workshop, and it was nice to go there again!
As for the left hand drill, the spiral on the flutes was definitely a left hand drill. I wouldn't be at all surprised if it was the only drill in the particular size they needed at the time.
I used to fool the apprentices who often had to sharpen the drills, by giving them a left hand drill to sharpen (without telling them of course) and it was fun to watch them stand by the grinder scratching their heads!
We always had a lot of left hand drills which we needed for an old chain driven multi spindle drill.
Must say I enjoyed the video, very good indeed!