So did Christian Bryant, drove me nuts! I played rugby for 15 years and was taught to tackle low and wrap up, with my head and eyes up. This is effective in the game of rugby as stopping the progress of the opposing player is the primary objective as they have to release the ball when brought to the ground and, with the exception of at the try (goal) line, forward progress really isn't an issue like it is in football, due to the free-flowing nature of the game. So I get what Chis is saying and agree, football tacklers need to make sure the ball carrier doesn't get that extra yardage and potentially a first down - which doesn't exist in rugby.
Chris may have seen tacklers in rugby games with their head and eyes down, but that isn't what they are taught, at least in any of the tradition rich rugby countries - New Zealand, England, South Africa, etc. - and even in the US. Also, in American football versus rugby, big hits are much more prevalent because a tackler will see the point of impact, particularly in a pass play, and be able to get from point A to point B with bad intent. With the free flowing nature of rugby, big hits, while you see some of them, are much less prevalent because the ball carrier will often pass or kick the ball before a big hit will take place and the tackler will ease up as a result, plus tacklers don't want to be taken out of the flow of the game, which is a result of a big hit.
So, good results for the Buckeyes from a change in tackling style and, at the end of the day, if they can adopt a technique that improves their chance of winning, I'm all for it!