It's old even with a grind.
Artifex's stunt was better:
1. Even if it's pretty obvious, it's actually new and the flip makes it even better.
2. He used the modification that makes the Cabbie different from other slow vehicles.
And don't be like "I tried Artifex' stunt and landed it in 7 min", because it's not like your stunt is harder or something. Your precision pass looked bad too.