This appears to have very little impact at the grass roots level. They are looking at a retrospective punishment following confirmation of a concussion, and presumably this will need video evidence of the tackler as well. I'm not sure this is really a new 'tackle law', more a new disciplinary sanction in the event of concussion.
Rugby could go down the route of NFL in making poor tackle technique an offence, but the differences are clearly less padding and therefore more onus in rugby to use proper technique, with poor technique more a result of a genuine error or the speed of the game rather than any attempt to injure opponents (as was the case on occasion in the NFL).