I don't think the "new tackling style" or attempts to "minimize penalty potential" you described is a thing with this staff. They consulted and/or visited with NFL staff and other college programs (Iowa in particular) to address technique and drills. The emphasis all preseason, especially in open field situations, has been on taking proper angles, wrapping up, and exploding through the tackle "with violence." FB will frequently go to the Oklahoma drill if the players are not being physical enough in tackeling.
I'd sure others who have been at practice can confirm this.
Brown said recently: “Everybody can say the normal tackling drills, things of that nature. But at some point in time, you’ve got to take your facemask and put it on his facemask and be willing to go hit. “I’m just not aware of why we’re diving at legs and all that. We just didn’t play the right brand of football.”