You are ignoring a KEY COMPONENT of that rule. "so as to force a restart." That is HUGE in this discussion. Iowa wrestlers aren't pushing out to force a restart. They are trying to force the opponent to push back and engage or at least make it obvious to the ref that isn't happening.
Intent is paramount here. The Iowa wrestlers that are usually the ones forcing their opponents out of bounds are the ones that have been scouted and their opponents simply don't engage and push back into the ties. This is especially true in Marinelli, Murin and DeSanto matches. It is obvious that many of these opponents have learned that most of the offense generated by the 3 listed, is predicated on close inside ties and pressure back into them.
Make no mistake, most of the guys pushing back are NOT wrestling at that point, especially when they go out of bounds. They could EASILY push back and/or circle to stay out of bounds, but that action opens up opportunities for these Hawkeyes to score.
You may not like it and obviously are not a Hawkeye fan. But, be a better fan of the sport and learn the nuances before complaining. When these Iowa wrestler are pushing in the ties it is literally the equivalent of JB taking a step or 2 back and level changing or Monday tapping the head a couple times, or Nick Lee snapping the head down hard or the Hidlays burying an underhook, etc. These are ALL setups for their offense and when most of their opponents go straight backwards to react to these they ARE they ones stalling. The same should be said for those backing up out of bounds...