It is harder to do this against a human for the fact it's more difficult to predict what direction the Dash Attack will launch them. Typically, I use this combo if they shield the Dash Attack and I end up on their other side, or if they Spot-Dodge it. Both of these cases ensure your opponent will stay grounding after the Dash Attack, leaving them open for the Reverse Boosted Pivot Grab.
But again, yes, it is harder to do against a human
Awesome, thank you for this! I didn't have anyone to practice the DI with :D