If the guy took the time to drill 2 holes I am not sure why he didn't just use a one hole strap and a tek screw but I would pass the tywrap.
The intent of keeping the cable away from the rockers was met.
"Cable tie" is one of the prescribed strapping methods as Niko pointed out.

The one I have problems with is when they just wrap it around the whole stud and sort of center the cable before they pull it tight.
I assume the rocker will cut it anyway so his rock will lay better. I have never had it on one of my jobs but I saw it in single family with Romex, my wife's job. Shortly after that they started using tywraps with the screw hole in them and a tek. I don't know if Lee County busted them or what.

Greg Fretwell