I think the table diagram is off, the balls look too big relative to the table, so hard to see the correct angle. (doesn't even look like a 7' table)
That said, this angle does seem to be thinner than the typical 2 rail angle. Maybe the 4 rail shot is better? It just looks funny in the diagram. I can't even put this same shot on my 9' table to set it up to shoot it because I don't know where to place the balls due to the diagram being out of proportion.
Do you posters play this shot, going from the 5B to the 6B, with about a tip of left English at 9:00 or do you hit it low, about 6:00?
https://pad.chalkysticks.com/54712.png