I have a neighbor that does go up on his roof year round, and winter snow is no impediment for him. I've confirmed that he's very hard working for keeping the house tidy, but he's not bright. Neither is his wife. No kids, so that's what it is.
Not believing that pic whatsoever. How in the world would he even get the machine all the way up there ?? Even if it's true, the frozen shingles would all be cracked after doing that IMO.
I'm sure its been done on a 3/12 roof! Not on that 5 or 6/12 though. AI does test your life experience and understanding of physics!
I would think the snow peeler thing would work better than the electric blower, but the guy is getting the job done.
My roof is 6/12 so snow doesn't build up very deep.